640850041025 has 6 divisors (see below), whose sum is σ = 794654050902. Its totient is φ = 512680032800.

The previous prime is 640850041009. The next prime is 640850041031. The reversal of 640850041025 is 520140058046.

It can be written as a sum of positive squares in 3 ways, for example, as 1862440336 + 638987600689 = 43156^2 + 799367^2 .

It is not a de Polignac number, because 640850041025 - 2⁴ = 640850041009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12817000796 + ... + 12817000845.

It is an arithmetic number, because the mean of its divisors is an integer number (132442341817).

Almost surely, 2^640850041025 is an apocalyptic number.

It is an amenable number.

640850041025 is a deficient number, since it is larger than the sum of its proper divisors (153804009877).

640850041025 is a wasteful number, since it uses less digits than its factorization.

640850041025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25634001651 (or 25634001646 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 640850041025 in words is "six hundred forty billion, eight hundred fifty million, forty-one thousand, twenty-five".