645839097452 has 24 divisors (see below), whose sum is σ = 1154063716176. Its totient is φ = 316171185408.

The previous prime is 645839097427. The next prime is 645839097487. The reversal of 645839097452 is 254790938546.

It is a super-2 number, since 2×645839097452² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8032178 + ... + 8112185.

It is an arithmetic number, because the mean of its divisors is an integer number (48085988174).

Almost surely, 2^645839097452 is an apocalyptic number.

It is an amenable number.

645839097452 is a deficient number, since it is larger than the sum of its proper divisors (508224618724).

645839097452 is a wasteful number, since it uses less digits than its factorization.

645839097452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16144577 (or 16144575 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 62.

The spelling of 645839097452 in words is "six hundred forty-five billion, eight hundred thirty-nine million, ninety-seven thousand, four hundred fifty-two".