172661396667 has 8 divisors (see below), whose sum is σ = 230539902480. Its totient is φ = 114945244320.

The previous prime is 172661396623. The next prime is 172661396669. The reversal of 172661396667 is 766693166271.

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

It is not a de Polignac number, because 172661396667 - 2¹⁹ = 172660872379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172661396667.

It is not an unprimeable number, because it can be changed into a prime (172661396669) 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, 40585884 + ... + 40590137.

It is an arithmetic number, because the mean of its divisors is an integer number (28817487810).

Almost surely, 2^172661396667 is an apocalyptic number.

172661396667 is a deficient number, since it is larger than the sum of its proper divisors (57878505813).

172661396667 is an equidigital number, since it uses as much as digits as its factorization.

172661396667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81176733.

The product of its digits is 20575296, while the sum is 60.

The spelling of 172661396667 in words is "one hundred seventy-two billion, six hundred sixty-one million, three hundred ninety-six thousand, six hundred sixty-seven".