81672772170 has 32 divisors (see below), whose sum is σ = 213834168000. Its totient is φ = 19799459840.

The previous prime is 81672772169. The next prime is 81672772201. The reversal of 81672772170 is 7127727618.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123746295 + ... + 123746954.

It is an arithmetic number, because the mean of its divisors is an integer number (6682317750).

Almost surely, 2^81672772170 is an apocalyptic number.

81672772170 is an abundant number, since it is smaller than the sum of its proper divisors (132161395830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81672772170 is a wasteful number, since it uses less digits than its factorization.

81672772170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247493270.

The product of its (nonzero) digits is 460992, while the sum is 48.

The spelling of 81672772170 in words is "eighty-one billion, six hundred seventy-two million, seven hundred seventy-two thousand, one hundred seventy".