645859049472 has 1020 divisors, whose sum is σ = 2429943094656. Its totient is φ = 169444638720.

The previous prime is 645859049449. The next prime is 645859049489. The reversal of 645859049472 is 274940958546.

645859049472 is a `hidden beast` number, since 6 + 4 + 58 + 5 + 90 + 494 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3381460897 + ... + 3381461087.

Almost surely, 2^645859049472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645859049472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1214971547328).

645859049472 is an abundant number, since it is smaller than the sum of its proper divisors (1784084045184).

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

645859049472 is an equidigital number, since it uses as much as digits as its factorization.

645859049472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 63.

The spelling of 645859049472 in words is "six hundred forty-five billion, eight hundred fifty-nine million, forty-nine thousand, four hundred seventy-two".