666368620037 has 2 divisors, whose sum is σ = 666368620038. Its totient is φ = 666368620036.

The previous prime is 666368620007. The next prime is 666368620039. The reversal of 666368620037 is 730026863666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666368546596 + 73441 = 816314^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 666368620037 - 2³² = 662073652741 is a prime.

Together with 666368620039, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666368620039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333184310018 + 333184310019.

It is an arithmetic number, because the mean of its divisors is an integer number (333184310019).

Almost surely, 2^666368620037 is an apocalyptic number.

It is an amenable number.

666368620037 is a deficient number, since it is larger than the sum of its proper divisors (1).

666368620037 is an equidigital number, since it uses as much as digits as its factorization.

666368620037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 53.

The spelling of 666368620037 in words is "six hundred sixty-six billion, three hundred sixty-eight million, six hundred twenty thousand, thirty-seven".