640370413 has 2 divisors, whose sum is σ = 640370414. Its totient is φ = 640370412.

The previous prime is 640370411. The next prime is 640370453. The reversal of 640370413 is 314073046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413024329 + 227346084 = 20323^2 + 15078^2 .

It is a cyclic number.

It is not a de Polignac number, because 640370413 - 2¹ = 640370411 is a prime.

Together with 640370411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640370411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320185206 + 320185207.

It is an arithmetic number, because the mean of its divisors is an integer number (320185207).

Almost surely, 2^640370413 is an apocalyptic number.

It is an amenable number.

640370413 is a deficient number, since it is larger than the sum of its proper divisors (1).

640370413 is an equidigital number, since it uses as much as digits as its factorization.

640370413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 640370413 is about 25305.5411520876. The cubic root of 640370413 is about 861.9401003268.

The spelling of 640370413 in words is "six hundred forty million, three hundred seventy thousand, four hundred thirteen".