78791564671 has 8 divisors (see below), whose sum is σ = 79773926400. Its totient is φ = 77815139160.

The previous prime is 78791564659. The next prime is 78791564717. The reversal of 78791564671 is 17646519787.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78791564671 is a prime.

It is a super-2 number, since 2×78791564671² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78791564611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457341 + ... + 1510438.

It is an arithmetic number, because the mean of its divisors is an integer number (9971740800).

Almost surely, 2^78791564671 is an apocalyptic number.

78791564671 is a deficient number, since it is larger than the sum of its proper divisors (982361729).

78791564671 is a wasteful number, since it uses less digits than its factorization.

78791564671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968109.

The product of its digits is 17781120, while the sum is 61.

The spelling of 78791564671 in words is "seventy-eight billion, seven hundred ninety-one million, five hundred sixty-four thousand, six hundred seventy-one".