172891731066 has 32 divisors (see below), whose sum is σ = 351194633280. Its totient is φ = 56729942016.

The previous prime is 172891731037. The next prime is 172891731079. The reversal of 172891731066 is 660137198271.

It is a happy number.

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, 413800 + ... + 719036.

It is an arithmetic number, because the mean of its divisors is an integer number (10974832290).

Almost surely, 2^172891731066 is an apocalyptic number.

172891731066 is an abundant number, since it is smaller than the sum of its proper divisors (178302902214).

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

172891731066 is a wasteful number, since it uses less digits than its factorization.

172891731066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306718.

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 172891731066 in words is "one hundred seventy-two billion, eight hundred ninety-one million, seven hundred thirty-one thousand, sixty-six".