645736945746 has 16 divisors (see below), whose sum is σ = 1291537682784. Its totient is φ = 215235016704.

The previous prime is 645736945691. The next prime is 645736945751. The reversal of 645736945746 is 647549637546.

645736945746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2525871 + ... + 2769746.

It is an arithmetic number, because the mean of its divisors is an integer number (80721105174).

Almost surely, 2^645736945746 is an apocalyptic number.

645736945746 is an abundant number, since it is smaller than the sum of its proper divisors (645800737038).

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

645736945746 is a wasteful number, since it uses less digits than its factorization.

645736945746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315945.

The product of its digits is 457228800, while the sum is 66.

The spelling of 645736945746 in words is "six hundred forty-five billion, seven hundred thirty-six million, nine hundred forty-five thousand, seven hundred forty-six".