1099557765604 has 81 divisors (see below), whose sum is σ = 2007049159227. Its totient is φ = 527084076288.

The previous prime is 1099557765587. The next prime is 1099557765611. The reversal of 1099557765604 is 4065677559901.

The square root of 1099557765604 is 1048598.

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 64145692900 + 1035412072704 = 253270^2 + 1017552^2 .

It is a super-2 number, since 2×1099557765604² (a number of 25 digits) contains 22 as substring.

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, 8025969024 + ... + 8025969160.

Almost surely, 2^{1099557765604} is an apocalyptic number.

1099557765604 is the 1048598-th square number.

It is an amenable number.

1099557765604 is a deficient number, since it is larger than the sum of its proper divisors (907491393623).

1099557765604 is an frugal number, since it uses more digits than its factorization.

1099557765604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 71442000, while the sum is 64.

Multiplying 1099557765604 by its sum of digits (64), we get a square (70371696998656 = 8388784²).

The spelling of 1099557765604 in words is "one trillion, ninety-nine billion, five hundred fifty-seven million, seven hundred sixty-five thousand, six hundred four".