79882978621 has 16 divisors (see below), whose sum is σ = 82853950464. Its totient is φ = 76966498224.

The previous prime is 79882978619. The next prime is 79882978657. The reversal of 79882978621 is 12687928897.

It is a cyclic number.

It is not a de Polignac number, because 79882978621 - 2¹ = 79882978619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79882978661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5418366 + ... + 5433088.

It is an arithmetic number, because the mean of its divisors is an integer number (5178371904).

Almost surely, 2^79882978621 is an apocalyptic number.

It is an amenable number.

79882978621 is a deficient number, since it is larger than the sum of its proper divisors (2970971843).

79882978621 is a wasteful number, since it uses less digits than its factorization.

79882978621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16560.

The product of its digits is 48771072, while the sum is 67.

The spelling of 79882978621 in words is "seventy-nine billion, eight hundred eighty-two million, nine hundred seventy-eight thousand, six hundred twenty-one".