640541455 has 16 divisors (see below), whose sum is σ = 780321600. Its totient is φ = 504697600.

The previous prime is 640541449. The next prime is 640541491. The reversal of 640541455 is 554145046.

It is not a de Polignac number, because 640541455 - 2⁵ = 640541423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640541455.

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, 117030 + ... + 122380.

It is an arithmetic number, because the mean of its divisors is an integer number (48770100).

Almost surely, 2^640541455 is an apocalyptic number.

640541455 is a deficient number, since it is larger than the sum of its proper divisors (139780145).

640541455 is a wasteful number, since it uses less digits than its factorization.

640541455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5714.

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 640541455 is about 25308.9204629514. The cubic root of 640541455 is about 862.0168344751.

The spelling of 640541455 in words is "six hundred forty million, five hundred forty-one thousand, four hundred fifty-five".