155817996690 has 64 divisors (see below), whose sum is σ = 388395159552. Its totient is φ = 39964363200.

The previous prime is 155817996533. The next prime is 155817996709. The reversal of 155817996690 is 96699718551.

155817996690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155817996690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 362356 + ... + 665535.

It is an arithmetic number, because the mean of its divisors is an integer number (6068674368).

Almost surely, 2^155817996690 is an apocalyptic number.

155817996690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155817996690 is an abundant number, since it is smaller than the sum of its proper divisors (232577162862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155817996690 is a wasteful number, since it uses less digits than its factorization.

155817996690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028095.

The product of its (nonzero) digits is 36741600, while the sum is 66.

The spelling of 155817996690 in words is "one hundred fifty-five billion, eight hundred seventeen million, nine hundred ninety-six thousand, six hundred ninety".