81168677 has 4 divisors (see below), whose sum is σ = 81186720. Its totient is φ = 81150636.

The previous prime is 81168673. The next prime is 81168707. The reversal of 81168677 is 77686118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81168677 - 2² = 81168673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81168673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3824 + ... + 13302.

It is an arithmetic number, because the mean of its divisors is an integer number (20296680).

Almost surely, 2^81168677 is an apocalyptic number.

It is an amenable number.

81168677 is a deficient number, since it is larger than the sum of its proper divisors (18043).

81168677 is an equidigital number, since it uses as much as digits as its factorization.

81168677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18042.

The product of its digits is 112896, while the sum is 44.

The square root of 81168677 is about 9009.3660709286. The cubic root of 81168677 is about 432.9750015347.

The spelling of 81168677 in words is "eighty-one million, one hundred sixty-eight thousand, six hundred seventy-seven".