78942979767 has 4 divisors (see below), whose sum is σ = 105257306360. Its totient is φ = 52628653176.

The previous prime is 78942979757. The next prime is 78942979769. The reversal of 78942979767 is 76797924987.

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

It is not a de Polignac number, because 78942979767 - 2¹⁴ = 78942963383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78942979769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13157163292 + ... + 13157163297.

It is an arithmetic number, because the mean of its divisors is an integer number (26314326590).

Almost surely, 2^78942979767 is an apocalyptic number.

78942979767 is a deficient number, since it is larger than the sum of its proper divisors (26314326593).

78942979767 is a wasteful number, since it uses less digits than its factorization.

78942979767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26314326592.

The product of its digits is 672126336, while the sum is 75.

The spelling of 78942979767 in words is "seventy-eight billion, nine hundred forty-two million, nine hundred seventy-nine thousand, seven hundred sixty-seven".