640154886474 has 96 divisors (see below), whose sum is σ = 1363436236800. Its totient is φ = 200338056864.

The previous prime is 640154886407. The next prime is 640154886479. The reversal of 640154886474 is 474688451046.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (640154886479) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113359119 + ... + 113364765.

It is an arithmetic number, because the mean of its divisors is an integer number (14202460800).

Almost surely, 2^640154886474 is an apocalyptic number.

640154886474 is an abundant number, since it is smaller than the sum of its proper divisors (723281350326).

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

640154886474 is a wasteful number, since it uses less digits than its factorization.

640154886474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152 (or 6133 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 57.

The spelling of 640154886474 in words is "six hundred forty billion, one hundred fifty-four million, eight hundred eighty-six thousand, four hundred seventy-four".