1655901640 has 16 divisors (see below), whose sum is σ = 3725778780. Its totient is φ = 662360640.

The previous prime is 1655901619. The next prime is 1655901671. The reversal of 1655901640 is 461095561.

It can be written as a sum of positive squares in 2 ways, for example, as 1621350756 + 34550884 = 40266^2 + 5878^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1655901640.

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, 20698731 + ... + 20698810.

Almost surely, 2^1655901640 is an apocalyptic number.

1655901640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655901640 is an abundant number, since it is smaller than the sum of its proper divisors (2069877140).

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

1655901640 is a wasteful number, since it uses less digits than its factorization.

1655901640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41397552 (or 41397548 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1655901640 is about 40692.7713482383. The cubic root of 1655901640 is about 1183.0729156930.

The spelling of 1655901640 in words is "one billion, six hundred fifty-five million, nine hundred one thousand, six hundred forty".