9857979826564 has 81 divisors (see below), whose sum is σ = 18060196920591. Its totient is φ = 4708105923840.

The previous prime is 9857979826537. The next prime is 9857979826579. The reversal of 9857979826564 is 4656289797589.

The square root of 9857979826564 is 3139742.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4082994092164 + 5774985734400 = 2020642^2 + 2403120^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17325096072 + ... + 17325096640.

Almost surely, 2^{9857979826564} is an apocalyptic number.

9857979826564 is the 3139742-nd square number.

It is an amenable number.

9857979826564 is a deficient number, since it is larger than the sum of its proper divisors (8202217094027).

9857979826564 is an frugal number, since it uses more digits than its factorization.

9857979826564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382 (or 691 counting only the distinct ones).

The product of its digits is 16460236800, while the sum is 85.

The spelling of 9857979826564 in words is "nine trillion, eight hundred fifty-seven billion, nine hundred seventy-nine million, eight hundred twenty-six thousand, five hundred sixty-four".