769238538561 has 20 divisors (see below), whose sum is σ = 1149149086932. Its totient is φ = 512807990688.

The previous prime is 769238538559. The next prime is 769238538569. The reversal of 769238538561 is 165835832967.

769238538561 is a `hidden beast` number, since 7 + 6 + 9 + 2 + 38 + 5 + 38 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3317760000 + 765920778561 = 57600^2 + 875169^2 .

It is not a de Polignac number, because 769238538561 - 2¹ = 769238538559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (769238538569) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2453631 + ... + 2749323.

Almost surely, 2^769238538561 is an apocalyptic number.

It is an amenable number.

769238538561 is a deficient number, since it is larger than the sum of its proper divisors (379910548371).

769238538561 is a wasteful number, since it uses less digits than its factorization.

769238538561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327822 (or 327813 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 769238538561 in words is "seven hundred sixty-nine billion, two hundred thirty-eight million, five hundred thirty-eight thousand, five hundred sixty-one".