155321005513 has 4 divisors (see below), whose sum is σ = 155356528068. Its totient is φ = 155285482960.

The previous prime is 155321005453. The next prime is 155321005517. The reversal of 155321005513 is 315500123551.

155321005513 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.

It can be written as a sum of positive squares in 2 ways, for example, as 53873659449 + 101447346064 = 232107^2 + 318508^2 .

It is a cyclic number.

It is not a de Polignac number, because 155321005513 - 2¹⁷ = 155320874441 is a prime.

It is a super-2 number, since 2×155321005513² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155321005517) 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 3 ways as a sum of consecutive naturals, for example, 17754718 + ... + 17763463.

It is an arithmetic number, because the mean of its divisors is an integer number (38839132017).

Almost surely, 2^155321005513 is an apocalyptic number.

It is an amenable number.

155321005513 is a deficient number, since it is larger than the sum of its proper divisors (35522555).

155321005513 is an equidigital number, since it uses as much as digits as its factorization.

155321005513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35522554.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 155321005513 in words is "one hundred fifty-five billion, three hundred twenty-one million, five thousand, five hundred thirteen".