172664166707551 has 8 divisors (see below), whose sum is σ = 186384107990880. Its totient is φ = 159461959057632.

The previous prime is 172664166707537. The next prime is 172664166707581. The reversal of 172664166707551 is 155707661466271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172664166707551 - 2⁷ = 172664166707423 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 (172664166707581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129433407660 + ... + 129433408993.

It is an arithmetic number, because the mean of its divisors is an integer number (23298013498860).

Almost surely, 2^{172664166707551} is an apocalyptic number.

172664166707551 is a deficient number, since it is larger than the sum of its proper divisors (13719941283329).

172664166707551 is a wasteful number, since it uses less digits than its factorization.

172664166707551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258866816705.

The product of its (nonzero) digits is 88905600, while the sum is 64.

The spelling of 172664166707551 in words is "one hundred seventy-two trillion, six hundred sixty-four billion, one hundred sixty-six million, seven hundred seven thousand, five hundred fifty-one".