66131144 has 16 divisors (see below), whose sum is σ = 125847600. Its totient is φ = 32571792.

The previous prime is 66131129. The next prime is 66131161. The reversal of 66131144 is 44113166.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61154 + ... + 62225.

It is an arithmetic number, because the mean of its divisors is an integer number (7865475).

Almost surely, 2^66131144 is an apocalyptic number.

It is an amenable number.

66131144 is a deficient number, since it is larger than the sum of its proper divisors (59716456).

66131144 is a wasteful number, since it uses less digits than its factorization.

66131144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123452 (or 123448 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 66131144 is about 8132.1057543542. The cubic root of 66131144 is about 404.3914938484.

The spelling of 66131144 in words is "sixty-six million, one hundred thirty-one thousand, one hundred forty-four".