640370411 has 2 divisors, whose sum is σ = 640370412. Its totient is φ = 640370410.

The previous prime is 640370407. The next prime is 640370413. The reversal of 640370411 is 114073046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640370411 - 2² = 640370407 is a prime.

Together with 640370413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640370413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320185205 + 320185206.

It is an arithmetic number, because the mean of its divisors is an integer number (320185206).

Almost surely, 2^640370411 is an apocalyptic number.

640370411 is a deficient number, since it is larger than the sum of its proper divisors (1).

640370411 is an equidigital number, since it uses as much as digits as its factorization.

640370411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 640370411 is about 25305.5411125706. The cubic root of 640370411 is about 861.9400994295.

The spelling of 640370411 in words is "six hundred forty million, three hundred seventy thousand, four hundred eleven".