66670646740 has 48 divisors (see below), whose sum is σ = 140432886720. Its totient is φ = 26587491840.

The previous prime is 66670646729. The next prime is 66670646741. The reversal of 66670646740 is 4764607666.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66670646741) 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 15 ways as a sum of consecutive naturals, for example, 23649051 + ... + 23651869.

It is an arithmetic number, because the mean of its divisors is an integer number (2925685140).

Almost surely, 2^66670646740 is an apocalyptic number.

It is an amenable number.

66670646740 is an abundant number, since it is smaller than the sum of its proper divisors (73762239980).

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

66670646740 is a wasteful number, since it uses less digits than its factorization.

66670646740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992 (or 5990 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 52.

The spelling of 66670646740 in words is "sixty-six billion, six hundred seventy million, six hundred forty-six thousand, seven hundred forty".