769499138521 has 27 divisors (see below), whose sum is σ = 820536706269. Its totient is φ = 721530609408.

The previous prime is 769499138501. The next prime is 769499138533. The reversal of 769499138521 is 125831994967.

The square root of 769499138521 is 877211.

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

769499138521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17532672921 + 751966465600 = 132411^2 + 867160^2 .

It is not a de Polignac number, because 769499138521 - 2³⁷ = 632060185049 is a prime.

It is a super-2 number, since 2×769499138521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (769499138501) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2283380065 + ... + 2283380401.

Almost surely, 2^769499138521 is an apocalyptic number.

769499138521 is the 877211-st square number.

769499138521 is the 438606-th centered octagonal number.

It is an amenable number.

769499138521 is a deficient number, since it is larger than the sum of its proper divisors (51037567748).

769499138521 is an frugal number, since it uses more digits than its factorization.

769499138521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 493 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 64.

Multiplying 769499138521 by its sum of digits (64), we get a square (49247944865344 = 7017688²).

The spelling of 769499138521 in words is "seven hundred sixty-nine billion, four hundred ninety-nine million, one hundred thirty-eight thousand, five hundred twenty-one".