172772791761879 has 14 divisors (see below), whose sum is σ = 259040687786736. Its totient is φ = 115181861174100.

The previous prime is 172772791761833. The next prime is 172772791761881. The reversal of 172772791761879 is 978167197277271.

172772791761879 is a `hidden beast` number, since 1 + 7 + 277 + 279 + 1 + 7 + 6 + 1 + 8 + 79 = 666.

It is not a de Polignac number, because 172772791761879 - 2⁸ = 172772791761623 is a prime.

It is a super-2 number, since 2×172772791761879² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a junction number, because it is equal to n+sod(n) for n = 172772791761798 and 172772791761807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172772791361879) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 118499856447 + ... + 118499857904.

Almost surely, 2^{172772791761879} is an apocalyptic number.

172772791761879 is a deficient number, since it is larger than the sum of its proper divisors (86267896024857).

172772791761879 is an frugal number, since it uses more digits than its factorization.

172772791761879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236999714369 (or 236999714354 counting only the distinct ones).

The product of its digits is 1829677248, while the sum is 81.

The spelling of 172772791761879 in words is "one hundred seventy-two trillion, seven hundred seventy-two billion, seven hundred ninety-one million, seven hundred sixty-one thousand, eight hundred seventy-nine".