172198247679 has 16 divisors (see below), whose sum is σ = 270114899040. Its totient is φ = 108045959040.

The previous prime is 172198247671. The next prime is 172198247723. The reversal of 172198247679 is 976742891271.

172198247679 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 98 + 2 + 476 + 79 = 666.

It is not a de Polignac number, because 172198247679 - 2³ = 172198247671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172198247671) 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, 187579332 + ... + 187580249.

It is an arithmetic number, because the mean of its divisors is an integer number (16882181190).

Almost surely, 2^172198247679 is an apocalyptic number.

172198247679 is a deficient number, since it is larger than the sum of its proper divisors (97916651361).

172198247679 is a wasteful number, since it uses less digits than its factorization.

172198247679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375159607 (or 375159601 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 172198247679 in words is "one hundred seventy-two billion, one hundred ninety-eight million, two hundred forty-seven thousand, six hundred seventy-nine".