11722572171 has 36 divisors (see below), whose sum is σ = 17432784096. Its totient is φ = 7590024000.

The previous prime is 11722572109. The next prime is 11722572179. The reversal of 11722572171 is 17127522711.

It is a happy number.

11722572171 is a `hidden beast` number, since 1 + 1 + 72 + 2 + 572 + 17 + 1 = 666.

It is not a de Polignac number, because 11722572171 - 2⁹ = 11722571659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11722572179) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2551086 + ... + 2555676.

Almost surely, 2^11722572171 is an apocalyptic number.

11722572171 is a deficient number, since it is larger than the sum of its proper divisors (5710211925).

11722572171 is a wasteful number, since it uses less digits than its factorization.

11722572171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804 (or 4748 counting only the distinct ones).

The product of its digits is 13720, while the sum is 36.

The spelling of 11722572171 in words is "eleven billion, seven hundred twenty-two million, five hundred seventy-two thousand, one hundred seventy-one".