640461164350 has 48 divisors (see below), whose sum is σ = 1383756139296. Its totient is φ = 215986896000.

The previous prime is 640461164341. The next prime is 640461164351. The reversal of 640461164350 is 53461164046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640461164351) 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, 14977741 + ... + 15020440.

It is an arithmetic number, because the mean of its divisors is an integer number (28828252902).

Almost surely, 2^640461164350 is an apocalyptic number.

640461164350 is an abundant number, since it is smaller than the sum of its proper divisors (743294974946).

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

640461164350 is a wasteful number, since it uses less digits than its factorization.

640461164350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29998261 (or 29998256 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 640461164350 in words is "six hundred forty billion, four hundred sixty-one million, one hundred sixty-four thousand, three hundred fifty".