76779716564 has 6 divisors (see below), whose sum is σ = 134364503994. Its totient is φ = 38389858280.

The previous prime is 76779716561. The next prime is 76779716567. The reversal of 76779716564 is 46561797767.

It is an interprime number because it is at equal distance from previous prime (76779716561) and next prime (76779716567).

It can be written as a sum of positive squares in only one way, i.e., 70414868164 + 6364848400 = 265358^2 + 79780^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 76779716564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76779716561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9597464567 + ... + 9597464574.

It is an arithmetic number, because the mean of its divisors is an integer number (22394083999).

Almost surely, 2^76779716564 is an apocalyptic number.

It is an amenable number.

76779716564 is a deficient number, since it is larger than the sum of its proper divisors (57584787430).

76779716564 is a wasteful number, since it uses less digits than its factorization.

76779716564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19194929145 (or 19194929143 counting only the distinct ones).

The product of its digits is 93350880, while the sum is 65.

The spelling of 76779716564 in words is "seventy-six billion, seven hundred seventy-nine million, seven hundred sixteen thousand, five hundred sixty-four".