79172020211 has 4 divisors (see below), whose sum is σ = 79872657672. Its totient is φ = 78471382752.

The previous prime is 79172020199. The next prime is 79172020223. The reversal of 79172020211 is 11202027197.

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 (79172020199) and next prime (79172020223).

It is a cyclic number.

It is not a de Polignac number, because 79172020211 - 2³⁴ = 61992151027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79172020511) 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, 350318561 + ... + 350318786.

It is an arithmetic number, because the mean of its divisors is an integer number (19968164418).

Almost surely, 2^79172020211 is an apocalyptic number.

79172020211 is a deficient number, since it is larger than the sum of its proper divisors (700637461).

79172020211 is a wasteful number, since it uses less digits than its factorization.

79172020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700637460.

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 79172020211 in words is "seventy-nine billion, one hundred seventy-two million, twenty thousand, two hundred eleven".