640053655 has 16 divisors (see below), whose sum is σ = 823547520. Its totient is φ = 475817472.

The previous prime is 640053649. The next prime is 640053671. The reversal of 640053655 is 556350046.

640053655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 640053655 - 2¹³ = 640045463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640053655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40944 + ... + 54373.

It is an arithmetic number, because the mean of its divisors is an integer number (51471720).

Almost surely, 2^640053655 is an apocalyptic number.

640053655 is a deficient number, since it is larger than the sum of its proper divisors (183493865).

640053655 is a wasteful number, since it uses less digits than its factorization.

640053655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95418.

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 640053655 is about 25299.2817091711. The cubic root of 640053655 is about 861.7979578801.

The spelling of 640053655 in words is "six hundred forty million, fifty-three thousand, six hundred fifty-five".