640854858546 has 48 divisors (see below), whose sum is σ = 1625583068928. Its totient is φ = 178635499200.

The previous prime is 640854858541. The next prime is 640854858547. The reversal of 640854858546 is 645858458046.

640854858546 is a `hidden beast` number, since 6 + 4 + 0 + 8 + 5 + 4 + 8 + 585 + 46 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (640854858541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62021050 + ... + 62031381.

It is an arithmetic number, because the mean of its divisors is an integer number (33866313936).

Almost surely, 2^640854858546 is an apocalyptic number.

640854858546 is an abundant number, since it is smaller than the sum of its proper divisors (984728210382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640854858546 is a wasteful number, since it uses less digits than its factorization.

640854858546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124052487 (or 124052484 counting only the distinct ones).

The product of its (nonzero) digits is 147456000, while the sum is 63.

The spelling of 640854858546 in words is "six hundred forty billion, eight hundred fifty-four million, eight hundred fifty-eight thousand, five hundred forty-six".