645613255892 has 48 divisors (see below), whose sum is σ = 1283186732352. Its totient is φ = 281617793280.

The previous prime is 645613255871. The next prime is 645613255897. The reversal of 645613255892 is 298552316546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645613255897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2597378 + ... + 2835065.

It is an arithmetic number, because the mean of its divisors is an integer number (26733056924).

Almost surely, 2^645613255892 is an apocalyptic number.

It is an amenable number.

645613255892 is a deficient number, since it is larger than the sum of its proper divisors (637573476460).

645613255892 is a wasteful number, since it uses less digits than its factorization.

645613255892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5432568 (or 5432566 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 56.

The spelling of 645613255892 in words is "six hundred forty-five billion, six hundred thirteen million, two hundred fifty-five thousand, eight hundred ninety-two".