766734561 has 12 divisors (see below), whose sum is σ = 1172653092. Its totient is φ = 481088256.

The previous prime is 766734497. The next prime is 766734583. The reversal of 766734561 is 165437667.

It can be written as a sum of positive squares in 2 ways, for example, as 319158225 + 447576336 = 17865^2 + 21156^2 .

It is not a de Polignac number, because 766734561 - 2⁶ = 766734497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (766734961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2505516 + ... + 2505821.

It is an arithmetic number, because the mean of its divisors is an integer number (97721091).

Almost surely, 2^766734561 is an apocalyptic number.

It is an amenable number.

766734561 is a deficient number, since it is larger than the sum of its proper divisors (405918531).

766734561 is a wasteful number, since it uses less digits than its factorization.

766734561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011360 (or 5011357 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 766734561 is about 27689.9722101702. The cubic root of 766734561 is about 915.2681432164.

The spelling of 766734561 in words is "seven hundred sixty-six million, seven hundred thirty-four thousand, five hundred sixty-one".