66700812 has 24 divisors (see below), whose sum is σ = 161002800. Its totient is φ = 21466816.

The previous prime is 66700807. The next prime is 66700813. The reversal of 66700812 is 21800766.

It is a happy number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66700812.

It is not an unprimeable number, because it can be changed into a prime (66700813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95487 + ... + 96182.

It is an arithmetic number, because the mean of its divisors is an integer number (6708450).

Almost surely, 2^66700812 is an apocalyptic number.

It is an amenable number.

66700812 is an abundant number, since it is smaller than the sum of its proper divisors (94301988).

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

66700812 is a wasteful number, since it uses less digits than its factorization.

66700812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191705 (or 191703 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 66700812 is about 8167.0565077021. The cubic root of 66700812 is about 405.5493474943.

The spelling of 66700812 in words is "sixty-six million, seven hundred thousand, eight hundred twelve".