79218736019 has 4 divisors (see below), whose sum is σ = 80561426520. Its totient is φ = 77876045520.

The previous prime is 79218736001. The next prime is 79218736027. The reversal of 79218736019 is 91063781297.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79218736019 - 2⁸ = 79218735763 is a prime.

It is a super-2 number, since 2×79218736019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79218726019) 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, 671345162 + ... + 671345279.

It is an arithmetic number, because the mean of its divisors is an integer number (20140356630).

Almost surely, 2^79218736019 is an apocalyptic number.

79218736019 is a deficient number, since it is larger than the sum of its proper divisors (1342690501).

79218736019 is a wasteful number, since it uses less digits than its factorization.

79218736019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342690500.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 79218736019 in words is "seventy-nine billion, two hundred eighteen million, seven hundred thirty-six thousand, nineteen".