645347745188 has 12 divisors (see below), whose sum is σ = 1129373438172. Its totient is φ = 322669620000.

The previous prime is 645347745179. The next prime is 645347745197. The reversal of 645347745188 is 881547743546.

It is an interprime number because it is at equal distance from previous prime (645347745179) and next prime (645347745197).

It can be written as a sum of positive squares in 2 ways, for example, as 604378746724 + 40968998464 = 777418^2 + 202408^2 .

It is a super-3 number, since 3×645347745188³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645347745188.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708563 + ... + 1338938.

It is an arithmetic number, because the mean of its divisors is an integer number (94114453181).

Almost surely, 2^645347745188 is an apocalyptic number.

It is an amenable number.

645347745188 is a deficient number, since it is larger than the sum of its proper divisors (484025692984).

645347745188 is a wasteful number, since it uses less digits than its factorization.

645347745188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126302 (or 2126300 counting only the distinct ones).

The product of its digits is 90316800, while the sum is 62.

The spelling of 645347745188 in words is "six hundred forty-five billion, three hundred forty-seven million, seven hundred forty-five thousand, one hundred eighty-eight".