77634332651 has 4 divisors (see below), whose sum is σ = 77695997400. Its totient is φ = 77572667904.

The previous prime is 77634332639. The next prime is 77634332653. The reversal of 77634332651 is 15623343677.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77634332651 is a prime.

It is a super-2 number, since 2×77634332651² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77634332596 and 77634332605.

It is not an unprimeable number, because it can be changed into a prime (77634332653) 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, 30830486 + ... + 30833003.

It is an arithmetic number, because the mean of its divisors is an integer number (19423999350).

Almost surely, 2^77634332651 is an apocalyptic number.

77634332651 is a deficient number, since it is larger than the sum of its proper divisors (61664749).

77634332651 is a wasteful number, since it uses less digits than its factorization.

77634332651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61664748.

The product of its digits is 1905120, while the sum is 47.

The spelling of 77634332651 in words is "seventy-seven billion, six hundred thirty-four million, three hundred thirty-two thousand, six hundred fifty-one".