77516112121979 has 8 divisors (see below), whose sum is σ = 81597611811840. Its totient is φ = 73434782863656.

The previous prime is 77516112121969. The next prime is 77516112122021. The reversal of 77516112121979 is 97912121161577.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77516112121979 - 2⁴ = 77516112121963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77516112121919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41673767 + ... + 43494080.

It is an arithmetic number, because the mean of its divisors is an integer number (10199701476480).

Almost surely, 2^{77516112121979} is an apocalyptic number.

77516112121979 is a deficient number, since it is larger than the sum of its proper divisors (4081499689861).

77516112121979 is a wasteful number, since it uses less digits than its factorization.

77516112121979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85215769.

The product of its digits is 3333960, while the sum is 59.

The spelling of 77516112121979 in words is "seventy-seven trillion, five hundred sixteen billion, one hundred twelve million, one hundred twenty-one thousand, nine hundred seventy-nine".