11640172791 has 16 divisors (see below), whose sum is σ = 16717954176. Its totient is φ = 7161529056.

The previous prime is 11640172781. The next prime is 11640172813. The reversal of 11640172791 is 19727104611.

It is a happy number.

It is not a de Polignac number, because 11640172791 - 2²⁶ = 11573063927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11640172781) 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, 148936 + ... + 213218.

It is an arithmetic number, because the mean of its divisors is an integer number (1044872136).

Almost surely, 2^11640172791 is an apocalyptic number.

11640172791 is a deficient number, since it is larger than the sum of its proper divisors (5077781385).

11640172791 is a wasteful number, since it uses less digits than its factorization.

11640172791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68942.

The product of its (nonzero) digits is 21168, while the sum is 39.

The spelling of 11640172791 in words is "eleven billion, six hundred forty million, one hundred seventy-two thousand, seven hundred ninety-one".