172666917279 has 48 divisors (see below), whose sum is σ = 277410744000. Its totient is φ = 102933777408.

The previous prime is 172666917277. The next prime is 172666917287. The reversal of 172666917279 is 972719666271.

It is not a de Polignac number, because 172666917279 - 2¹ = 172666917277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172666917271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 359677 + ... + 688985.

It is an arithmetic number, because the mean of its divisors is an integer number (5779390500).

Almost surely, 2^172666917279 is an apocalyptic number.

172666917279 is a deficient number, since it is larger than the sum of its proper divisors (104743826721).

172666917279 is a wasteful number, since it uses less digits than its factorization.

172666917279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329504 (or 329501 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 63.

The spelling of 172666917279 in words is "one hundred seventy-two billion, six hundred sixty-six million, nine hundred seventeen thousand, two hundred seventy-nine".