79218551499 has 4 divisors (see below), whose sum is σ = 105624735336. Its totient is φ = 52812367664.

The previous prime is 79218551491. The next prime is 79218551507. The reversal of 79218551499 is 99415581297.

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

It is an interprime number because it is at equal distance from previous prime (79218551491) and next prime (79218551507).

It is a cyclic number.

It is not a de Polignac number, because 79218551499 - 2³ = 79218551491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79218551491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13203091914 + ... + 13203091919.

It is an arithmetic number, because the mean of its divisors is an integer number (26406183834).

Almost surely, 2^79218551499 is an apocalyptic number.

79218551499 is a deficient number, since it is larger than the sum of its proper divisors (26406183837).

79218551499 is a wasteful number, since it uses less digits than its factorization.

79218551499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26406183836.

The product of its digits is 8164800, while the sum is 60.

The spelling of 79218551499 in words is "seventy-nine billion, two hundred eighteen million, five hundred fifty-one thousand, four hundred ninety-nine".