666735737 has 2 divisors, whose sum is σ = 666735738. Its totient is φ = 666735736.

The previous prime is 666735697. The next prime is 666735739. The reversal of 666735737 is 737537666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368793616 + 297942121 = 19204^2 + 17261^2 .

It is a cyclic number.

It is not a de Polignac number, because 666735737 - 2²⁰ = 665687161 is a prime.

Together with 666735739, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666735739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333367868 + 333367869.

It is an arithmetic number, because the mean of its divisors is an integer number (333367869).

Almost surely, 2^666735737 is an apocalyptic number.

It is an amenable number.

666735737 is a deficient number, since it is larger than the sum of its proper divisors (1).

666735737 is an equidigital number, since it uses as much as digits as its factorization.

666735737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 50.

The square root of 666735737 is about 25821.2264813273. The cubic root of 666735737 is about 873.6106329414.

The spelling of 666735737 in words is "six hundred sixty-six million, seven hundred thirty-five thousand, seven hundred thirty-seven".