66138364 has 12 divisors (see below), whose sum is σ = 122550624. Its totient is φ = 31123904.

The previous prime is 66138361. The next prime is 66138367. The reversal of 66138364 is 46383166.

It is an interprime number because it is at equal distance from previous prime (66138361) and next prime (66138367).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66138361) 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, 486244 + ... + 486379.

It is an arithmetic number, because the mean of its divisors is an integer number (10212552).

Almost surely, 2^66138364 is an apocalyptic number.

It is an amenable number.

66138364 is a deficient number, since it is larger than the sum of its proper divisors (56412260).

66138364 is a wasteful number, since it uses less digits than its factorization.

66138364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972644 (or 972642 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 66138364 is about 8132.5496616990. The cubic root of 66138364 is about 404.4062100631.

The spelling of 66138364 in words is "sixty-six million, one hundred thirty-eight thousand, three hundred sixty-four".