646067951 has 2 divisors, whose sum is σ = 646067952. Its totient is φ = 646067950.

The previous prime is 646067921. The next prime is 646067971. The reversal of 646067951 is 159760646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646067951 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646067921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323033975 + 323033976.

It is an arithmetic number, because the mean of its divisors is an integer number (323033976).

Almost surely, 2^646067951 is an apocalyptic number.

646067951 is a deficient number, since it is larger than the sum of its proper divisors (1).

646067951 is an equidigital number, since it uses as much as digits as its factorization.

646067951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 646067951 is about 25417.8667672958. The cubic root of 646067951 is about 864.4888561342.

The spelling of 646067951 in words is "six hundred forty-six million, sixty-seven thousand, nine hundred fifty-one".