640266502350 has 48 divisors (see below), whose sum is σ = 1587913978608. Its totient is φ = 170732029440.

The previous prime is 640266502319. The next prime is 640266502357. The reversal of 640266502350 is 53205662046.

It is a junction number, because it is equal to n+sod(n) for n = 640266502299 and 640266502308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640266502357) 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, 6360612 + ... + 6460488.

It is an arithmetic number, because the mean of its divisors is an integer number (33081541221).

Almost surely, 2^640266502350 is an apocalyptic number.

640266502350 is an abundant number, since it is smaller than the sum of its proper divisors (947647476258).

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

640266502350 is a wasteful number, since it uses less digits than its factorization.

640266502350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142629 (or 142624 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 640266502350 in words is "six hundred forty billion, two hundred sixty-six million, five hundred two thousand, three hundred fifty".