766651636 has 12 divisors (see below), whose sum is σ = 1341834340. Its totient is φ = 383270400.

The previous prime is 766651631. The next prime is 766651643. The reversal of 766651636 is 636156667.

It can be written as a sum of positive squares in 2 ways, for example, as 409819536 + 356832100 = 20244^2 + 18890^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766651631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46036 + ... + 60436.

Almost surely, 2^766651636 is an apocalyptic number.

It is an amenable number.

766651636 is a deficient number, since it is larger than the sum of its proper divisors (575182704).

766651636 is a wasteful number, since it uses less digits than its factorization.

766651636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27714 (or 27712 counting only the distinct ones).

The product of its digits is 816480, while the sum is 46.

The square root of 766651636 is about 27688.4747864522. The cubic root of 766651636 is about 915.2351455529.

The spelling of 766651636 in words is "seven hundred sixty-six million, six hundred fifty-one thousand, six hundred thirty-six".