66490164 has 72 divisors (see below), whose sum is σ = 186880512. Its totient is φ = 19794240.

The previous prime is 66490163. The next prime is 66490187. The reversal of 66490164 is 46109466.

66490164 is a `hidden beast` number, since 6 + 6 + 490 + 164 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66490163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12217 + ... + 16799.

Almost surely, 2^66490164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66490164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93440256).

66490164 is an abundant number, since it is smaller than the sum of its proper divisors (120390348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66490164 is a wasteful number, since it uses less digits than its factorization.

66490164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4637 (or 4632 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 66490164 is about 8154.1501089936. The cubic root of 66490164 is about 405.1219751491.

The spelling of 66490164 in words is "sixty-six million, four hundred ninety thousand, one hundred sixty-four".