66670646715 has 24 divisors (see below), whose sum is σ = 115595829648. Its totient is φ = 35547408960.

The previous prime is 66670646711. The next prime is 66670646717. The reversal of 66670646715 is 51764607666.

It is a happy number.

It is not a de Polignac number, because 66670646715 - 2² = 66670646711 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66670646711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55104 + ... + 369293.

It is an arithmetic number, because the mean of its divisors is an integer number (4816492902).

Almost surely, 2^66670646715 is an apocalyptic number.

66670646715 is a deficient number, since it is larger than the sum of its proper divisors (48925182933).

66670646715 is a wasteful number, since it uses less digits than its factorization.

66670646715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427899 (or 427896 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 66670646715 in words is "sixty-six billion, six hundred seventy million, six hundred forty-six thousand, seven hundred fifteen".