555561640 has 16 divisors (see below), whose sum is σ = 1250013780. Its totient is φ = 222224640.

The previous prime is 555561593. The next prime is 555561659. The reversal of 555561640 is 46165555.

It can be written as a sum of positive squares in 2 ways, for example, as 549714916 + 5846724 = 23446^2 + 2418^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 555561640.

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, 6944481 + ... + 6944560.

Almost surely, 2^555561640 is an apocalyptic number.

It is an amenable number.

555561640 is an abundant number, since it is smaller than the sum of its proper divisors (694452140).

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

555561640 is a wasteful number, since it uses less digits than its factorization.

555561640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13889052 (or 13889048 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The square root of 555561640 is about 23570.3551097560. The cubic root of 555561640 is about 822.0736925386.

The spelling of 555561640 in words is "five hundred fifty-five million, five hundred sixty-one thousand, six hundred forty".