646415071 has 2 divisors, whose sum is σ = 646415072. Its totient is φ = 646415070.

The previous prime is 646415059. The next prime is 646415113. The reversal of 646415071 is 170514646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646415071 - 2²⁹ = 109544159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646425071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323207535 + 323207536.

It is an arithmetic number, because the mean of its divisors is an integer number (323207536).

Almost surely, 2^646415071 is an apocalyptic number.

646415071 is a deficient number, since it is larger than the sum of its proper divisors (1).

646415071 is an equidigital number, since it uses as much as digits as its factorization.

646415071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 646415071 is about 25424.6941181207. The cubic root of 646415071 is about 864.6436528779.

The spelling of 646415071 in words is "six hundred forty-six million, four hundred fifteen thousand, seventy-one".