6664540131 has 12 divisors (see below), whose sum is σ = 9627546552. Its totient is φ = 4442570496.

The previous prime is 6664540123. The next prime is 6664540133. The reversal of 6664540131 is 1310454666.

It is a happy number.

It is not a de Polignac number, because 6664540131 - 2³ = 6664540123 is a prime.

It is a super-2 number, since 2×6664540131² = 88832190315418994322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6664540133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70915 + ... + 135491.

It is an arithmetic number, because the mean of its divisors is an integer number (802295546).

Almost surely, 2^6664540131 is an apocalyptic number.

6664540131 is a deficient number, since it is larger than the sum of its proper divisors (2963006421).

6664540131 is a wasteful number, since it uses less digits than its factorization.

6664540131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76050 (or 76047 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6664540131 is about 81636.6347358831. The cubic root of 6664540131 is about 1881.8719218128.

Adding to 6664540131 its reverse (1310454666), we get a palindrome (7974994797).

The spelling of 6664540131 in words is "six billion, six hundred sixty-four million, five hundred forty thousand, one hundred thirty-one".