11665042531 has 8 divisors (see below), whose sum is σ = 11700077184. Its totient is φ = 11630061120.

The previous prime is 11665042517. The next prime is 11665042547. The reversal of 11665042531 is 13524056611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11665042531 - 2¹¹ = 11665040483 is a prime.

It is a super-2 number, since 2×11665042531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11665042231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449301 + ... + 474553.

It is an arithmetic number, because the mean of its divisors is an integer number (1462509648).

Almost surely, 2^11665042531 is an apocalyptic number.

11665042531 is a deficient number, since it is larger than the sum of its proper divisors (35034653).

11665042531 is an equidigital number, since it uses as much as digits as its factorization.

11665042531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26621.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 11665042531 in words is "eleven billion, six hundred sixty-five million, forty-two thousand, five hundred thirty-one".