155915999044 has 27 divisors (see below), whose sum is σ = 295475661117. Its totient is φ = 71956491984.

The previous prime is 155915999033. The next prime is 155915999051. The reversal of 155915999044 is 440999519551.

The square root of 155915999044 is 394862.

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

It can be written as a sum of positive squares in only one way, i.e., 23064496900 + 132851502144 = 151870^2 + 364488^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10258819 + ... + 10274005.

Almost surely, 2^155915999044 is an apocalyptic number.

155915999044 is the 394862-nd square number.

It is an amenable number.

155915999044 is a deficient number, since it is larger than the sum of its proper divisors (139559662073).

155915999044 is an frugal number, since it uses more digits than its factorization.

155915999044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30404 (or 15202 counting only the distinct ones).

The product of its (nonzero) digits is 13122000, while the sum is 61.

The spelling of 155915999044 in words is "one hundred fifty-five billion, nine hundred fifteen million, nine hundred ninety-nine thousand, forty-four".