66138004 has 12 divisors (see below), whose sum is σ = 119475328. Its totient is φ = 32002200.

The previous prime is 66138001. The next prime is 66138019. The reversal of 66138004 is 40083166.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66138001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266562 + ... + 266809.

Almost surely, 2^66138004 is an apocalyptic number.

It is an amenable number.

66138004 is a deficient number, since it is larger than the sum of its proper divisors (53337324).

66138004 is a wasteful number, since it uses less digits than its factorization.

66138004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533406 (or 533404 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66138004 is about 8132.5275283887. The cubic root of 66138004 is about 404.4054763159.

The spelling of 66138004 in words is "sixty-six million, one hundred thirty-eight thousand, four".