646623071 has 2 divisors, whose sum is σ = 646623072. Its totient is φ = 646623070.

The previous prime is 646623059. The next prime is 646623077. The reversal of 646623071 is 170326646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646623071 - 2¹⁴ = 646606687 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 (646623077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323311535 + 323311536.

It is an arithmetic number, because the mean of its divisors is an integer number (323311536).

Almost surely, 2^646623071 is an apocalyptic number.

646623071 is a deficient number, since it is larger than the sum of its proper divisors (1).

646623071 is an equidigital number, since it uses as much as digits as its factorization.

646623071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 646623071 is about 25428.7843004734. The cubic root of 646623071 is about 864.7363830763.

The spelling of 646623071 in words is "six hundred forty-six million, six hundred twenty-three thousand, seventy-one".