5699864978721 has 15 divisors (see below), whose sum is σ = 8514645214273. Its totient is φ = 3799895661180.

The previous prime is 5699864978711. The next prime is 5699864978737. The reversal of 5699864978721 is 1278794689965.

The square root of 5699864978721 is 2387439.

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

5699864978721 is a `hidden beast` number, since 56 + 9 + 9 + 8 + 6 + 497 + 8 + 72 + 1 = 666.

It is not a de Polignac number, because 5699864978721 - 2²⁵ = 5699831424289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5699864978711) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 21354316 + ... + 21619586.

Almost surely, 2^{5699864978721} is an apocalyptic number.

5699864978721 is the 2387439-th square number.

5699864978721 is the 1193720-th centered octagonal number.

It is an amenable number.

5699864978721 is a deficient number, since it is larger than the sum of its proper divisors (2814780235552).

5699864978721 is an frugal number, since it uses more digits than its factorization.

5699864978721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530554 (or 265274 counting only the distinct ones).

The product of its digits is 3292047360, while the sum is 81.

Multiplying 5699864978721 by its sum of digits (81), we get a square (461689063276401 = 21486951²).

5699864978721 divided by its sum of digits (81) gives a square (70368703441 = 265271²).

The spelling of 5699864978721 in words is "five trillion, six hundred ninety-nine billion, eight hundred sixty-four million, nine hundred seventy-eight thousand, seven hundred twenty-one".