66990006700 has 36 divisors (see below), whose sum is σ = 145394881632. Its totient is φ = 26791105600.

The previous prime is 66990006697. The next prime is 66990006709. The reversal of 66990006700 is 760009966.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66990006709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515757 + ... + 632443.

It is an arithmetic number, because the mean of its divisors is an integer number (4038746712).

Almost surely, 2^66990006700 is an apocalyptic number.

It is an amenable number.

66990006700 is an abundant number, since it is smaller than the sum of its proper divisors (78404874932).

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

66990006700 is a wasteful number, since it uses less digits than its factorization.

66990006700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122442 (or 122435 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 66990006700 in words is "sixty-six billion, nine hundred ninety million, six thousand, seven hundred".