66662712 has 96 divisors (see below), whose sum is σ = 193330800. Its totient is φ = 20677632.

The previous prime is 66662699. The next prime is 66662719. The reversal of 66662712 is 21726666.

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 (66662719) 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, 130714 + ... + 131222.

Almost surely, 2^66662712 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 66662712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96665400).

66662712 is an abundant number, since it is smaller than the sum of its proper divisors (126668088).

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

66662712 is a wasteful number, since it uses less digits than its factorization.

66662712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 638 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 66662712 is about 8164.7236327998. The cubic root of 66662712 is about 405.4721151859.

The spelling of 66662712 in words is "sixty-six million, six hundred sixty-two thousand, seven hundred twelve".