61774172871 has 8 divisors (see below), whose sum is σ = 83214693744. Its totient is φ = 40758216960.

The previous prime is 61774172857. The next prime is 61774172923. The reversal of 61774172871 is 17827147716.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61774172871 - 2²⁶ = 61707064007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61774172171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106140900 + ... + 106141481.

It is an arithmetic number, because the mean of its divisors is an integer number (10401836718).

Almost surely, 2^61774172871 is an apocalyptic number.

61774172871 is a deficient number, since it is larger than the sum of its proper divisors (21440520873).

61774172871 is a wasteful number, since it uses less digits than its factorization.

61774172871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212282481.

The product of its digits is 921984, while the sum is 51.

The spelling of 61774172871 in words is "sixty-one billion, seven hundred seventy-four million, one hundred seventy-two thousand, eight hundred seventy-one".