155638539330 has 64 divisors (see below), whose sum is σ = 393430089600. Its totient is φ = 39295411200.

The previous prime is 155638539317. The next prime is 155638539341. The reversal of 155638539330 is 33935836551.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 869530 + ... + 1033130.

It is an arithmetic number, because the mean of its divisors is an integer number (6147345150).

Almost surely, 2^155638539330 is an apocalyptic number.

155638539330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155638539330 is an abundant number, since it is smaller than the sum of its proper divisors (237791550270).

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

155638539330 is a wasteful number, since it uses less digits than its factorization.

155638539330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165299.

The product of its (nonzero) digits is 4374000, while the sum is 51.

The spelling of 155638539330 in words is "one hundred fifty-five billion, six hundred thirty-eight million, five hundred thirty-nine thousand, three hundred thirty".