640435305654 has 24 divisors (see below), whose sum is σ = 1387713927600. Its totient is φ = 213462420048.

The previous prime is 640435305599. The next prime is 640435305661. The reversal of 640435305654 is 456503534046.

640435305654 is a `hidden beast` number, since 6 + 40 + 43 + 5 + 3 + 0 + 565 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1086754 + ... + 1569045.

It is an arithmetic number, because the mean of its divisors is an integer number (57821413650).

Almost surely, 2^640435305654 is an apocalyptic number.

640435305654 is an abundant number, since it is smaller than the sum of its proper divisors (747278621946).

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

640435305654 is a wasteful number, since it uses less digits than its factorization.

640435305654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669204 (or 2669201 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 45.

The spelling of 640435305654 in words is "six hundred forty billion, four hundred thirty-five million, three hundred five thousand, six hundred fifty-four".