11665312431 has 16 divisors (see below), whose sum is σ = 16753551360. Its totient is φ = 7198788960.

The previous prime is 11665312361. The next prime is 11665312453. The reversal of 11665312431 is 13421356611.

It is a happy number.

It is not a de Polignac number, because 11665312431 - 2⁹ = 11665311919 is a prime.

It is a super-2 number, since 2×11665312431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11665312392 and 11665312401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665312831) 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, 2724676 + ... + 2728953.

It is an arithmetic number, because the mean of its divisors is an integer number (1047096960).

Almost surely, 2^11665312431 is an apocalyptic number.

11665312431 is a deficient number, since it is larger than the sum of its proper divisors (5088238929).

11665312431 is a wasteful number, since it uses less digits than its factorization.

11665312431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453686.

The product of its digits is 12960, while the sum is 33.

The spelling of 11665312431 in words is "eleven billion, six hundred sixty-five million, three hundred twelve thousand, four hundred thirty-one".