77766881260634 has 4 divisors (see below), whose sum is σ = 116650321890954. Its totient is φ = 38883440630316.

The previous prime is 77766881260633. The next prime is 77766881260657. The reversal of 77766881260634 is 43606218866777.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 69649823848609 + 8117057412025 = 8345647^2 + 2849045^2 .

It is not an unprimeable number, because it can be changed into a prime (77766881260633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19441720315157 + ... + 19441720315160.

Almost surely, 2^{77766881260634} is an apocalyptic number.

77766881260634 is a deficient number, since it is larger than the sum of its proper divisors (38883440630320).

77766881260634 is a wasteful number, since it uses less digits than its factorization.

77766881260634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38883440630319.

The product of its (nonzero) digits is 682795008, while the sum is 71.

The spelling of 77766881260634 in words is "seventy-seven trillion, seven hundred sixty-six billion, eight hundred eighty-one million, two hundred sixty thousand, six hundred thirty-four".