79378166021 has 32 divisors (see below), whose sum is σ = 99928657920. Its totient is φ = 61762765680.

The previous prime is 79378165991. The next prime is 79378166027. The reversal of 79378166021 is 12066187397.

It is not a de Polignac number, because 79378166021 - 2⁶ = 79378165957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79378166027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6767600 + ... + 6779318.

It is an arithmetic number, because the mean of its divisors is an integer number (3122770560).

Almost surely, 2^79378166021 is an apocalyptic number.

It is an amenable number.

79378166021 is a deficient number, since it is larger than the sum of its proper divisors (20550491899).

79378166021 is a wasteful number, since it uses less digits than its factorization.

79378166021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12486 (or 12464 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 79378166021 in words is "seventy-nine billion, three hundred seventy-eight million, one hundred sixty-six thousand, twenty-one".