640455242405 has 32 divisors (see below), whose sum is σ = 858661630848. Its totient is φ = 454668595200.

The previous prime is 640455242393. The next prime is 640455242437. The reversal of 640455242405 is 504242554046.

640455242405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640455242405 - 2⁴ = 640455242389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432791 + ... + 1211700.

It is an arithmetic number, because the mean of its divisors is an integer number (26833175964).

Almost surely, 2^640455242405 is an apocalyptic number.

It is an amenable number.

640455242405 is a deficient number, since it is larger than the sum of its proper divisors (218206388443).

640455242405 is a wasteful number, since it uses less digits than its factorization.

640455242405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644677.

The product of its (nonzero) digits is 768000, while the sum is 41.

The spelling of 640455242405 in words is "six hundred forty billion, four hundred fifty-five million, two hundred forty-two thousand, four hundred five".