645851388371 has 6 divisors (see below), whose sum is σ = 751296513060. Its totient is φ = 553586904276.

The previous prime is 645851388353. The next prime is 645851388461. The reversal of 645851388371 is 173883158546.

It is not a de Polignac number, because 645851388371 - 2²⁶ = 645784279507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645851388371.

It is not an unprimeable number, because it can be changed into a prime (645851388331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6590320241 + ... + 6590320338.

It is an arithmetic number, because the mean of its divisors is an integer number (125216085510).

Almost surely, 2^645851388371 is an apocalyptic number.

645851388371 is a deficient number, since it is larger than the sum of its proper divisors (105445124689).

645851388371 is a wasteful number, since it uses less digits than its factorization.

645851388371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13180640593 (or 13180640586 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 59.

The spelling of 645851388371 in words is "six hundred forty-five billion, eight hundred fifty-one million, three hundred eighty-eight thousand, three hundred seventy-one".