66131504 has 10 divisors (see below), whose sum is σ = 128129820. Its totient is φ = 33065744.

The previous prime is 66131501. The next prime is 66131531. The reversal of 66131504 is 40513166.

It is not an unprimeable number, because it can be changed into a prime (66131501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2066594 + ... + 2066625.

It is an arithmetic number, because the mean of its divisors is an integer number (12812982).

Almost surely, 2^66131504 is an apocalyptic number.

It is an amenable number.

66131504 is a deficient number, since it is larger than the sum of its proper divisors (61998316).

66131504 is a wasteful number, since it uses less digits than its factorization.

66131504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133227 (or 4133221 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 66131504 is about 8132.1278888124. The cubic root of 66131504 is about 404.3922276462.

The spelling of 66131504 in words is "sixty-six million, one hundred thirty-one thousand, five hundred four".