66663612 has 36 divisors (see below), whose sum is σ = 171695160. Its totient is φ = 21801312.

The previous prime is 66663601. The next prime is 66663617. The reversal of 66663612 is 21636666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66663617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15562 + ... + 19377.

It is an arithmetic number, because the mean of its divisors is an integer number (4769310).

Almost surely, 2^66663612 is an apocalyptic number.

It is an amenable number.

66663612 is an abundant number, since it is smaller than the sum of its proper divisors (105031548).

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

66663612 is a wasteful number, since it uses less digits than its factorization.

66663612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35002 (or 34997 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 66663612 is about 8164.7787477678. The cubic root of 66663612 is about 405.4739399104.

The spelling of 66663612 in words is "sixty-six million, six hundred sixty-three thousand, six hundred twelve".