79218654689 has 4 divisors (see below), whose sum is σ = 79510974720. Its totient is φ = 78926334660.

The previous prime is 79218654661. The next prime is 79218654703. The reversal of 79218654689 is 98645681297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79218654689 - 2¹² = 79218650593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79218654649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146159609 + ... + 146160150.

It is an arithmetic number, because the mean of its divisors is an integer number (19877743680).

Almost surely, 2^79218654689 is an apocalyptic number.

It is an amenable number.

79218654689 is a deficient number, since it is larger than the sum of its proper divisors (292320031).

79218654689 is a wasteful number, since it uses less digits than its factorization.

79218654689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292320030.

The product of its digits is 52254720, while the sum is 65.

The spelling of 79218654689 in words is "seventy-nine billion, two hundred eighteen million, six hundred fifty-four thousand, six hundred eighty-nine".