640207227458 has 54 divisors (see below), whose sum is σ = 1067141628441. Its totient is φ = 287975966784.

The previous prime is 640207227449. The next prime is 640207227467. The reversal of 640207227458 is 854722702046.

It is an interprime number because it is at equal distance from previous prime (640207227449) and next prime (640207227467).

It can be written as a sum of positive squares in 2 ways, for example, as 585933604369 + 54273623089 = 765463^2 + 232967^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=565777.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 442436891 + ... + 442438337.

Almost surely, 2^640207227458 is an apocalyptic number.

640207227458 is a deficient number, since it is larger than the sum of its proper divisors (426934400983).

640207227458 is an equidigital number, since it uses as much as digits as its factorization.

640207227458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976 (or 1489 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 47.

The spelling of 640207227458 in words is "six hundred forty billion, two hundred seven million, two hundred twenty-seven thousand, four hundred fifty-eight".