1620556625 has 32 divisors (see below), whose sum is σ = 2058201600. Its totient is φ = 1273708800.

The previous prime is 1620556601. The next prime is 1620556643. The reversal of 1620556625 is 5266550261.

It is a happy number.

It is not a de Polignac number, because 1620556625 - 2²⁴ = 1603779409 is a prime.

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, 3742409 + ... + 3742841.

It is an arithmetic number, because the mean of its divisors is an integer number (64318800).

Almost surely, 2^1620556625 is an apocalyptic number.

It is an amenable number.

1620556625 is a deficient number, since it is larger than the sum of its proper divisors (437644975).

1620556625 is an equidigital number, since it uses as much as digits as its factorization.

1620556625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 896 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 1620556625 is about 40256.1377307858. The cubic root of 1620556625 is about 1174.5947901081.

The spelling of 1620556625 in words is "one billion, six hundred twenty million, five hundred fifty-six thousand, six hundred twenty-five".