77934370816 has 28 divisors (see below), whose sum is σ = 155859244542. Its totient is φ = 38967181312.

The previous prime is 77934370799. The next prime is 77934370819. The reversal of 77934370816 is 61807343977.

It can be written as a sum of positive squares in only one way, i.e., 76123017216 + 1811353600 = 275904^2 + 42560^2 .

It is not an unprimeable number, because it can be changed into a prime (77934370819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4748545 + ... + 4764928.

Almost surely, 2^77934370816 is an apocalyptic number.

It is an amenable number.

77934370816 is a deficient number, since it is larger than the sum of its proper divisors (77924873726).

77934370816 is an frugal number, since it uses more digits than its factorization.

77934370816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9513499 (or 9513475 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 77934370816 in words is "seventy-seven billion, nine hundred thirty-four million, three hundred seventy thousand, eight hundred sixteen".