1620465556 has 12 divisors (see below), whose sum is σ = 2836454292. Its totient is φ = 810050048.

The previous prime is 1620465547. The next prime is 1620465563. The reversal of 1620465556 is 6555640261.

It can be written as a sum of positive squares in 2 ways, for example, as 1328602500 + 291863056 = 36450^2 + 17084^2 .

It is a congruent number.

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, 24655 + ... + 62038.

It is an arithmetic number, because the mean of its divisors is an integer number (236371191).

Almost surely, 2^1620465556 is an apocalyptic number.

It is an amenable number.

1620465556 is a deficient number, since it is larger than the sum of its proper divisors (1215988736).

1620465556 is a wasteful number, since it uses less digits than its factorization.

1620465556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91370 (or 91368 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 1620465556 is about 40255.0065954534. The cubic root of 1620465556 is about 1174.5727871380.

The spelling of 1620465556 in words is "one billion, six hundred twenty million, four hundred sixty-five thousand, five hundred fifty-six".