66301812 has 36 divisors (see below), whose sum is σ = 169898820. Its totient is φ = 21796992.

The previous prime is 66301799. The next prime is 66301841. The reversal of 66301812 is 21810366.

66301812 is a `hidden beast` number, since 6 + 630 + 18 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17943696 + 48358116 = 4236^2 + 6954^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9987 + ... + 15242.

Almost surely, 2^66301812 is an apocalyptic number.

It is an amenable number.

66301812 is an abundant number, since it is smaller than the sum of its proper divisors (103597008).

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

66301812 is a wasteful number, since it uses less digits than its factorization.

66301812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25312 (or 25307 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 66301812 is about 8142.5924618637. The cubic root of 66301812 is about 404.7390728994.

The spelling of 66301812 in words is "sixty-six million, three hundred one thousand, eight hundred twelve".