99774172771 has 8 divisors (see below), whose sum is σ = 122798981984. Its totient is φ = 78942202560.

The previous prime is 99774172741. The next prime is 99774172781. The reversal of 99774172771 is 17727147799.

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

It is not a de Polignac number, because 99774172771 - 2⁵ = 99774172739 is a prime.

It is the 315871-st Hogben number.

It is not an unprimeable number, because it can be changed into a prime (99774172741) by changing a digit.

It is a nontrivial repunit in base 315870.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548209650 + ... + 548209831.

It is an arithmetic number, because the mean of its divisors is an integer number (15349872748).

Almost surely, 2^99774172771 is an apocalyptic number.

99774172771 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

99774172771 is a deficient number, since it is larger than the sum of its proper divisors (23024809213).

99774172771 is a wasteful number, since it uses less digits than its factorization.

99774172771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096419501.

The product of its digits is 10890936, while the sum is 61.

The spelling of 99774172771 in words is "ninety-nine billion, seven hundred seventy-four million, one hundred seventy-two thousand, seven hundred seventy-one".