77930639999 has 4 divisors (see below), whose sum is σ = 77937690240. Its totient is φ = 77923589760.

The previous prime is 77930639987. The next prime is 77930640017. The reversal of 77930639999 is 99993603977.

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-77930639999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77930639929) 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, 3508514 + ... + 3530655.

It is an arithmetic number, because the mean of its divisors is an integer number (19484422560).

Almost surely, 2^77930639999 is an apocalyptic number.

77930639999 is a deficient number, since it is larger than the sum of its proper divisors (7050241).

77930639999 is a wasteful number, since it uses less digits than its factorization.

77930639999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050240.

The product of its (nonzero) digits is 156243654, while the sum is 71.

The spelling of 77930639999 in words is "seventy-seven billion, nine hundred thirty million, six hundred thirty-nine thousand, nine hundred ninety-nine".