666998890007 has 2 divisors, whose sum is σ = 666998890008. Its totient is φ = 666998890006.

The previous prime is 666998889959. The next prime is 666998890021. The reversal of 666998890007 is 700098899666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666998890007 - 2³² = 662703922711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666998860007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333499445003 + 333499445004.

It is an arithmetic number, because the mean of its divisors is an integer number (333499445004).

Almost surely, 2^666998890007 is an apocalyptic number.

666998890007 is a deficient number, since it is larger than the sum of its proper divisors (1).

666998890007 is an equidigital number, since it uses as much as digits as its factorization.

666998890007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70543872, while the sum is 68.

The spelling of 666998890007 in words is "six hundred sixty-six billion, nine hundred ninety-eight million, eight hundred ninety thousand, seven".