78711967621 has 8 divisors (see below), whose sum is σ = 90153379520. Its totient is φ = 67319767008.

The previous prime is 78711967613. The next prime is 78711967627. The reversal of 78711967621 is 12676911787.

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 78711967621 - 2³ = 78711967613 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 (78711967627) 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, 12299391 + ... + 12305788.

It is an arithmetic number, because the mean of its divisors is an integer number (11269172440).

Almost surely, 2^78711967621 is an apocalyptic number.

It is an amenable number.

78711967621 is a deficient number, since it is larger than the sum of its proper divisors (11441411899).

78711967621 is a wasteful number, since it uses less digits than its factorization.

78711967621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24605643.

The product of its digits is 1778112, while the sum is 55.

The spelling of 78711967621 in words is "seventy-eight billion, seven hundred eleven million, nine hundred sixty-seven thousand, six hundred twenty-one".