666970303640 has 16 divisors (see below), whose sum is σ = 1500683183280. Its totient is φ = 266788121440.

The previous prime is 666970303631. The next prime is 666970303661. The reversal of 666970303640 is 46303079666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8337128756 + ... + 8337128835.

It is an arithmetic number, because the mean of its divisors is an integer number (93792698955).

Almost surely, 2^666970303640 is an apocalyptic number.

It is an amenable number.

666970303640 is an abundant number, since it is smaller than the sum of its proper divisors (833712879640).

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

666970303640 is a wasteful number, since it uses less digits than its factorization.

666970303640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16674257602 (or 16674257598 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 50.

The spelling of 666970303640 in words is "six hundred sixty-six billion, nine hundred seventy million, three hundred three thousand, six hundred forty".