172661256701772 has 48 divisors (see below), whose sum is σ = 408891746766720. Its totient is φ = 56694407882112.

The previous prime is 172661256701701. The next prime is 172661256701779. The reversal of 172661256701772 is 277107652166271.

172661256701772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172661256701779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162503179 + ... + 163562237.

It is an arithmetic number, because the mean of its divisors is an integer number (8518578057640).

Almost surely, 2^{172661256701772} is an apocalyptic number.

172661256701772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172661256701772 is an abundant number, since it is smaller than the sum of its proper divisors (236230490064948).

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

172661256701772 is a wasteful number, since it uses less digits than its factorization.

172661256701772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261910 (or 1261908 counting only the distinct ones).

The product of its (nonzero) digits is 20744640, while the sum is 60.

The spelling of 172661256701772 in words is "one hundred seventy-two trillion, six hundred sixty-one billion, two hundred fifty-six million, seven hundred one thousand, seven hundred seventy-two".