77971166 has 32 divisors (see below), whose sum is σ = 144764928. Its totient is φ = 30670560.

The previous prime is 77971139. The next prime is 77971177. The reversal of 77971166 is 66117977.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 33641 + ... + 35883.

It is an arithmetic number, because the mean of its divisors is an integer number (4523904).

Almost surely, 2^77971166 is an apocalyptic number.

77971166 is a deficient number, since it is larger than the sum of its proper divisors (66793762).

77971166 is a wasteful number, since it uses less digits than its factorization.

77971166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456.

The product of its digits is 111132, while the sum is 44.

The square root of 77971166 is about 8830.1283116385. The cubic root of 77971166 is about 427.2132130312.

The spelling of 77971166 in words is "seventy-seven million, nine hundred seventy-one thousand, one hundred sixty-six".