172158373861 has 8 divisors (see below), whose sum is σ = 177761583104. Its totient is φ = 166558271760.

The previous prime is 172158373843. The next prime is 172158373867. The reversal of 172158373861 is 168373851271.

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 172158373861 - 2²³ = 172149985253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172158373799 and 172158373808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172158373867) 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, 663906 + ... + 886051.

It is an arithmetic number, because the mean of its divisors is an integer number (22220197888).

Almost surely, 2^172158373861 is an apocalyptic number.

It is an amenable number.

172158373861 is a deficient number, since it is larger than the sum of its proper divisors (5603209243).

172158373861 is a wasteful number, since it uses less digits than its factorization.

172158373861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553571.

The product of its digits is 1693440, while the sum is 52.

The spelling of 172158373861 in words is "one hundred seventy-two billion, one hundred fifty-eight million, three hundred seventy-three thousand, eight hundred sixty-one".