172666917278 has 8 divisors (see below), whose sum is σ = 259047474840. Its totient is φ = 86317759000.

The previous prime is 172666917277. The next prime is 172666917287. The reversal of 172666917278 is 872719666271.

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

It is a self number, because there is not a number n which added to its sum of digits gives 172666917278.

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 3 ways as a sum of consecutive naturals, for example, 7836068 + ... + 7858071.

It is an arithmetic number, because the mean of its divisors is an integer number (32380934355).

Almost surely, 2^172666917278 is an apocalyptic number.

172666917278 is a deficient number, since it is larger than the sum of its proper divisors (86380557562).

172666917278 is a wasteful number, since it uses less digits than its factorization.

172666917278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15699642.

The product of its digits is 21337344, while the sum is 62.

The spelling of 172666917278 in words is "one hundred seventy-two billion, six hundred sixty-six million, nine hundred seventeen thousand, two hundred seventy-eight".