155513499904 has 135 divisors (see below), whose sum is σ = 362855945543. Its totient is φ = 66516140544.

The previous prime is 155513499899. The next prime is 155513499907. The reversal of 155513499904 is 409994315551.

The square root of 155513499904 is 394352.

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

It is not an unprimeable number, because it can be changed into a prime (155513499907) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 309171717 + ... + 309172219.

Almost surely, 2^155513499904 is an apocalyptic number.

155513499904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

155513499904 is the 394352-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155513499904

155513499904 is an abundant number, since it is smaller than the sum of its proper divisors (207342445639).

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

155513499904 is an frugal number, since it uses more digits than its factorization.

155513499904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 55.

The spelling of 155513499904 in words is "one hundred fifty-five billion, five hundred thirteen million, four hundred ninety-nine thousand, nine hundred four".