646113737 has 2 divisors, whose sum is σ = 646113738. Its totient is φ = 646113736.

The previous prime is 646113731. The next prime is 646113751. The reversal of 646113737 is 737311646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640140601 + 5973136 = 25301^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 646113737 - 2⁶ = 646113673 is a prime.

It is a super-2 number, since 2×646113737² = 834925922280210338, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646113737.

It is not a weakly prime, because it can be changed into another prime (646113731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323056868 + 323056869.

It is an arithmetic number, because the mean of its divisors is an integer number (323056869).

Almost surely, 2^646113737 is an apocalyptic number.

It is an amenable number.

646113737 is a deficient number, since it is larger than the sum of its proper divisors (1).

646113737 is an equidigital number, since it uses as much as digits as its factorization.

646113737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 646113737 is about 25418.7674170090. The cubic root of 646113737 is about 864.5092773874.

The spelling of 646113737 in words is "six hundred forty-six million, one hundred thirteen thousand, seven hundred thirty-seven".