666615703797 has 8 divisors (see below), whose sum is σ = 987578820480. Its totient is φ = 444410469180.

The previous prime is 666615703781. The next prime is 666615703801. The reversal of 666615703797 is 797307516666.

It is not a de Polignac number, because 666615703797 - 2⁴ = 666615703781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666615703727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12344735229 + ... + 12344735282.

It is an arithmetic number, because the mean of its divisors is an integer number (123447352560).

Almost surely, 2^666615703797 is an apocalyptic number.

It is an amenable number.

666615703797 is a deficient number, since it is larger than the sum of its proper divisors (320963116683).

666615703797 is a wasteful number, since it uses less digits than its factorization.

666615703797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24689470520 (or 24689470514 counting only the distinct ones).

The product of its (nonzero) digits is 60011280, while the sum is 63.

The spelling of 666615703797 in words is "six hundred sixty-six billion, six hundred fifteen million, seven hundred three thousand, seven hundred ninety-seven".