155780590640 has 20 divisors (see below), whose sum is σ = 362189873424. Its totient is φ = 62312236224.

The previous prime is 155780590627. The next prime is 155780590663. The reversal of 155780590640 is 46095087551.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973628612 + ... + 973628771.

Almost surely, 2^155780590640 is an apocalyptic number.

155780590640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155780590640 is an abundant number, since it is smaller than the sum of its proper divisors (206409282784).

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

155780590640 is a wasteful number, since it uses less digits than its factorization.

155780590640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947257396 (or 1947257390 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 50.

The spelling of 155780590640 in words is "one hundred fifty-five billion, seven hundred eighty million, five hundred ninety thousand, six hundred forty".