72569355769 has 3 divisors (see below), whose sum is σ = 72569625157. Its totient is φ = 72569086382.

The previous prime is 72569355757. The next prime is 72569355811. The reversal of 72569355769 is 96755396527.

The square root of 72569355769 is 269387.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 72569355769 - 2⁷ = 72569355641 is a prime.

It is a super-2 number, since 2×72569355769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72569355769.

It is not an unprimeable number, because it can be changed into a prime (72569355739) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 134694 + ... + 404080.

Almost surely, 2^72569355769 is an apocalyptic number.

72569355769 is the 269387-th square number.

72569355769 is the 134694-th centered octagonal number.

It is an amenable number.

72569355769 is a deficient number, since it is larger than the sum of its proper divisors (269388).

72569355769 is an frugal number, since it uses more digits than its factorization.

72569355769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538774 (or 269387 counting only the distinct ones).

The product of its digits is 107163000, while the sum is 64.

Multiplying 72569355769 by its sum of digits (64), we get a square (4644438769216 = 2155096²).

The spelling of 72569355769 in words is "seventy-two billion, five hundred sixty-nine million, three hundred fifty-five thousand, seven hundred sixty-nine".