155972090987440 has 80 divisors (see below), whose sum is σ = 446320137307968. Its totient is φ = 49362595826688.

The previous prime is 155972090987371. The next prime is 155972090987551. The reversal of 155972090987440 is 44789090279551.

155972090987440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 155972090987440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10712361607 + ... + 10712376166.

Almost surely, 2^{155972090987440} is an apocalyptic number.

155972090987440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155972090987440 is an abundant number, since it is smaller than the sum of its proper divisors (290348046320528).

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

155972090987440 is a wasteful number, since it uses less digits than its factorization.

155972090987440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21424737806 (or 21424737800 counting only the distinct ones).

The product of its (nonzero) digits is 228614400, while the sum is 70.

The spelling of 155972090987440 in words is "one hundred fifty-five trillion, nine hundred seventy-two billion, ninety million, nine hundred eighty-seven thousand, four hundred forty".