155356587409 has 3 divisors (see below), whose sum is σ = 155356981563. Its totient is φ = 155356193256.

The previous prime is 155356587403. The next prime is 155356587427. The reversal of 155356587409 is 904785653551.

It is a happy number.

The square root of 155356587409 is 394153.

It is a perfect power (a square), and thus also a powerful number.

155356587409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 153746331025 + 1610256384 = 392105^2 + 40128^2 .

It is not a de Polignac number, because 155356587409 - 2³ = 155356587401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155356587401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 197077 + ... + 591229.

It is an arithmetic number, because the mean of its divisors is an integer number (51785660521).

Almost surely, 2^155356587409 is an apocalyptic number.

155356587409 is the 394153-rd square number.

155356587409 is the 197077-th centered octagonal number.

It is an amenable number.

155356587409 is a deficient number, since it is larger than the sum of its proper divisors (394154).

155356587409 is an frugal number, since it uses more digits than its factorization.

155356587409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788306 (or 394153 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 58.

The spelling of 155356587409 in words is "one hundred fifty-five billion, three hundred fifty-six million, five hundred eighty-seven thousand, four hundred nine".