640455242404 has 12 divisors (see below), whose sum is σ = 1130715229644. Its totient is φ = 317393748224.

The previous prime is 640455242393. The next prime is 640455242437. The reversal of 640455242404 is 404242554046.

It can be written as a sum of positive squares in 2 ways, for example, as 105626300004 + 534828942400 = 325002^2 + 731320^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708467737 + ... + 708468640.

It is an arithmetic number, because the mean of its divisors is an integer number (94226269137).

Almost surely, 2^640455242404 is an apocalyptic number.

It is an amenable number.

640455242404 is a deficient number, since it is larger than the sum of its proper divisors (490259987240).

640455242404 is a wasteful number, since it uses less digits than its factorization.

640455242404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416936494 (or 1416936492 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 40.

The spelling of 640455242404 in words is "six hundred forty billion, four hundred fifty-five million, two hundred forty-two thousand, four hundred four".