66670646739 has 16 divisors (see below), whose sum is σ = 89257504128. Its totient is φ = 44265739392.

The previous prime is 66670646729. The next prime is 66670646741. The reversal of 66670646739 is 93764607666.

It is not a de Polignac number, because 66670646739 - 2²⁴ = 66653869523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66670646729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 880624 + ... + 953330.

It is an arithmetic number, because the mean of its divisors is an integer number (5578594008).

Almost surely, 2^66670646739 is an apocalyptic number.

66670646739 is a deficient number, since it is larger than the sum of its proper divisors (22586857389).

66670646739 is a wasteful number, since it uses less digits than its factorization.

66670646739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73954.

The product of its (nonzero) digits is 41150592, while the sum is 60.

The spelling of 66670646739 in words is "sixty-six billion, six hundred seventy million, six hundred forty-six thousand, seven hundred thirty-nine".