77312915191699 has 4 divisors (see below), whose sum is σ = 84341362027320. Its totient is φ = 70284468356080.

The previous prime is 77312915191669. The next prime is 77312915191703. The reversal of 77312915191699 is 99619151921377.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-77312915191699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77312915191619) 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, 3514223417794 + ... + 3514223417815.

It is an arithmetic number, because the mean of its divisors is an integer number (21085340506830).

Almost surely, 2^{77312915191699} is an apocalyptic number.

77312915191699 is a deficient number, since it is larger than the sum of its proper divisors (7028446835621).

77312915191699 is a wasteful number, since it uses less digits than its factorization.

77312915191699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7028446835620.

The product of its digits is 57868020, while the sum is 70.

The spelling of 77312915191699 in words is "seventy-seven trillion, three hundred twelve billion, nine hundred fifteen million, one hundred ninety-one thousand, six hundred ninety-nine".