77937706391 has 12 divisors (see below), whose sum is σ = 80591482800. Its totient is φ = 75368747520.

The previous prime is 77937706387. The next prime is 77937706411. The reversal of 77937706391 is 19360773977.

It is not a de Polignac number, because 77937706391 - 2² = 77937706387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77937706391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77937706351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1325270 + ... + 1382828.

It is an arithmetic number, because the mean of its divisors is an integer number (6715956900).

Almost surely, 2^77937706391 is an apocalyptic number.

77937706391 is a deficient number, since it is larger than the sum of its proper divisors (2653776409).

77937706391 is a wasteful number, since it uses less digits than its factorization.

77937706391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59030 (or 58999 counting only the distinct ones).

The product of its (nonzero) digits is 10501974, while the sum is 59.

The spelling of 77937706391 in words is "seventy-seven billion, nine hundred thirty-seven million, seven hundred six thousand, three hundred ninety-one".