172146726664 has 128 divisors (see below), whose sum is σ = 373183303680. Its totient is φ = 73743667200.

The previous prime is 172146726659. The next prime is 172146726671. The reversal of 172146726664 is 466627641271.

It is a super-2 number, since 2×172146726664² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12620392 + ... + 12634024.

It is an arithmetic number, because the mean of its divisors is an integer number (2915494560).

Almost surely, 2^172146726664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172146726664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186591651840).

172146726664 is an abundant number, since it is smaller than the sum of its proper divisors (201036577016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172146726664 is a wasteful number, since it uses less digits than its factorization.

172146726664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13811 (or 13807 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 52.

The spelling of 172146726664 in words is "one hundred seventy-two billion, one hundred forty-six million, seven hundred twenty-six thousand, six hundred sixty-four".