131666564 has 24 divisors (see below), whose sum is σ = 245605248. Its totient is φ = 61545600.

The previous prime is 131666543. The next prime is 131666567. The reversal of 131666564 is 465666131.

It is not an unprimeable number, because it can be changed into a prime (131666567) 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, 3857 + ... + 16679.

It is an arithmetic number, because the mean of its divisors is an integer number (10233552).

Almost surely, 2^131666564 is an apocalyptic number.

It is an amenable number.

131666564 is a deficient number, since it is larger than the sum of its proper divisors (113938684).

131666564 is a wasteful number, since it uses less digits than its factorization.

131666564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12995 (or 12993 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 131666564 is about 11474.6051783928. The cubic root of 131666564 is about 508.7352539559.

The spelling of 131666564 in words is "one hundred thirty-one million, six hundred sixty-six thousand, five hundred sixty-four".