640496713 has 2 divisors, whose sum is σ = 640496714. Its totient is φ = 640496712.

The previous prime is 640496693. The next prime is 640496719. The reversal of 640496713 is 317694046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640494864 + 1849 = 25308^2 + 43^2 .

It is a cyclic number.

It is not a de Polignac number, because 640496713 - 2⁹ = 640496201 is a prime.

It is not a weakly prime, because it can be changed into another prime (640496719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320248356 + 320248357.

It is an arithmetic number, because the mean of its divisors is an integer number (320248357).

Almost surely, 2^640496713 is an apocalyptic number.

It is an amenable number.

640496713 is a deficient number, since it is larger than the sum of its proper divisors (1).

640496713 is an equidigital number, since it uses as much as digits as its factorization.

640496713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 640496713 is about 25308.0365299246. The cubic root of 640496713 is about 861.9967633020.

The spelling of 640496713 in words is "six hundred forty million, four hundred ninety-six thousand, seven hundred thirteen".