640115464397 has 2 divisors, whose sum is σ = 640115464398. Its totient is φ = 640115464396.

The previous prime is 640115464337. The next prime is 640115464453. The reversal of 640115464397 is 793464511046.

640115464397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626450088196 + 13665376201 = 791486^2 + 116899^2 .

It is a cyclic number.

It is not a de Polignac number, because 640115464397 - 2⁶ = 640115464333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640115464337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320057732198 + 320057732199.

It is an arithmetic number, because the mean of its divisors is an integer number (320057732199).

Almost surely, 2^640115464397 is an apocalyptic number.

It is an amenable number.

640115464397 is a deficient number, since it is larger than the sum of its proper divisors (1).

640115464397 is an equidigital number, since it uses as much as digits as its factorization.

640115464397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 640115464397 in words is "six hundred forty billion, one hundred fifteen million, four hundred sixty-four thousand, three hundred ninety-seven".