66423612 has 12 divisors (see below), whose sum is σ = 154988456. Its totient is φ = 22141200.

The previous prime is 66423611. The next prime is 66423629. The reversal of 66423612 is 21632466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66423612² = 8824192462253088, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66423612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66423611) 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, 2767639 + ... + 2767662.

Almost surely, 2^66423612 is an apocalyptic number.

It is an amenable number.

66423612 is an abundant number, since it is smaller than the sum of its proper divisors (88564844).

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

66423612 is a wasteful number, since it uses less digits than its factorization.

66423612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5535308 (or 5535306 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 66423612 is about 8150.0682205734. The cubic root of 66423612 is about 404.9867637802.

The spelling of 66423612 in words is "sixty-six million, four hundred twenty-three thousand, six hundred twelve".