1020640565604 has 48 divisors (see below), whose sum is σ = 2598077401920. Its totient is φ = 309275111040.

The previous prime is 1020640565561. The next prime is 1020640565617. The reversal of 1020640565604 is 4065650460201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4729482 + ... + 4940574.

It is an arithmetic number, because the mean of its divisors is an integer number (54126612540).

Almost surely, 2^{1020640565604} is an apocalyptic number.

It is an amenable number.

1020640565604 is an abundant number, since it is smaller than the sum of its proper divisors (1577436836316).

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

1020640565604 is a wasteful number, since it uses less digits than its factorization.

1020640565604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247740 (or 247738 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 1020640565604 in words is "one trillion, twenty billion, six hundred forty million, five hundred sixty-five thousand, six hundred four".