172257492517687 has 4 divisors (see below), whose sum is σ = 182390286195216. Its totient is φ = 162124698840160.

The previous prime is 172257492517633. The next prime is 172257492517717. The reversal of 172257492517687 is 786715294752271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172257492517687 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 (172257492517087) 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, 5066396838739 + ... + 5066396838772.

It is an arithmetic number, because the mean of its divisors is an integer number (45597571548804).

Almost surely, 2^{172257492517687} is an apocalyptic number.

172257492517687 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

172257492517687 is a deficient number, since it is larger than the sum of its proper divisors (10132793677529).

172257492517687 is a wasteful number, since it uses less digits than its factorization.

172257492517687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10132793677528.

The product of its digits is 829785600, while the sum is 73.

The spelling of 172257492517687 in words is "one hundred seventy-two trillion, two hundred fifty-seven billion, four hundred ninety-two million, five hundred seventeen thousand, six hundred eighty-seven".