645805888750 has 120 divisors (see below), whose sum is σ = 1332664829496. Its totient is φ = 234465000000.

The previous prime is 645805888709. The next prime is 645805888751. The reversal of 645805888750 is 57888508546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645805888751) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 106023205 + ... + 106029295.

Almost surely, 2^645805888750 is an apocalyptic number.

645805888750 is an abundant number, since it is smaller than the sum of its proper divisors (686858940746).

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

645805888750 is a wasteful number, since it uses less digits than its factorization.

645805888750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6836 (or 6810 counting only the distinct ones).

The product of its (nonzero) digits is 86016000, while the sum is 64.

The spelling of 645805888750 in words is "six hundred forty-five billion, eight hundred five million, eight hundred eighty-eight thousand, seven hundred fifty".