172727126381 has 16 divisors (see below), whose sum is σ = 183764110320. Its totient is φ = 162117457920.

The previous prime is 172727126323. The next prime is 172727126393. The reversal of 172727126381 is 183621727271.

It can be written as a sum of positive squares in 8 ways, for example, as 42990290281 + 129736836100 = 207341^2 + 360190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172727126381 is a prime.

It is a super-2 number, since 2×172727126381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172727126681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504656 + ... + 774681.

It is an arithmetic number, because the mean of its divisors is an integer number (11485256895).

Almost surely, 2^172727126381 is an apocalyptic number.

It is an amenable number.

172727126381 is a deficient number, since it is larger than the sum of its proper divisors (11036983939).

172727126381 is a wasteful number, since it uses less digits than its factorization.

172727126381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279504.

The product of its digits is 395136, while the sum is 47.

The spelling of 172727126381 in words is "one hundred seventy-two billion, seven hundred twenty-seven million, one hundred twenty-six thousand, three hundred eighty-one".