155803838249 has 4 divisors (see below), whose sum is σ = 155804628564. Its totient is φ = 155803047936.

The previous prime is 155803838231. The next prime is 155803838251. The reversal of 155803838249 is 942838308551.

It is a happy number.

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 2 ways, for example, as 99197911849 + 56605926400 = 314957^2 + 237920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155803838249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155803838194 and 155803838203.

It is not an unprimeable number, because it can be changed into a prime (155803838219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169709 + ... + 583445.

It is an arithmetic number, because the mean of its divisors is an integer number (38951157141).

Almost surely, 2^155803838249 is an apocalyptic number.

It is an amenable number.

155803838249 is a deficient number, since it is larger than the sum of its proper divisors (790315).

155803838249 is an equidigital number, since it uses as much as digits as its factorization.

155803838249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790314.

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 155803838249 in words is "one hundred fifty-five billion, eight hundred three million, eight hundred thirty-eight thousand, two hundred forty-nine".