640255650462 has 96 divisors (see below), whose sum is σ = 1534001302080. Its totient is φ = 191966100480.

The previous prime is 640255650401. The next prime is 640255650493. The reversal of 640255650462 is 264056552046.

640255650462 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 556 + 50 + 46 + 2 = 666.

640255650462 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×640255650462³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8273364 + ... + 8350392.

It is an arithmetic number, because the mean of its divisors is an integer number (15979180230).

Almost surely, 2^640255650462 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640255650462, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767000651040).

640255650462 is an abundant number, since it is smaller than the sum of its proper divisors (893745651618).

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

640255650462 is a wasteful number, since it uses less digits than its factorization.

640255650462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78258 (or 78255 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 640255650462 in words is "six hundred forty billion, two hundred fifty-five million, six hundred fifty thousand, four hundred sixty-two".