640160401 has 2 divisors, whose sum is σ = 640160402. Its totient is φ = 640160400.

The previous prime is 640160387. The next prime is 640160441. The reversal of 640160401 is 104061046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376942225 + 263218176 = 19415^2 + 16224^2 .

It is a cyclic number.

It is not a de Polignac number, because 640160401 - 2²⁷ = 505942673 is a prime.

It is not a weakly prime, because it can be changed into another prime (640160441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320080200 + 320080201.

It is an arithmetic number, because the mean of its divisors is an integer number (320080201).

Almost surely, 2^640160401 is an apocalyptic number.

It is an amenable number.

640160401 is a deficient number, since it is larger than the sum of its proper divisors (1).

640160401 is an equidigital number, since it uses as much as digits as its factorization.

640160401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 640160401 is about 25301.3912858562. The cubic root of 640160401 is about 861.8458644737.

The spelling of 640160401 in words is "six hundred forty million, one hundred sixty thousand, four hundred one".