645566055340 has 48 divisors (see below), whose sum is σ = 1415543623200. Its totient is φ = 246991926272.

The previous prime is 645566055317. The next prime is 645566055377. The reversal of 645566055340 is 43550665546.

645566055340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5139085 + ... + 5263204.

It is an arithmetic number, because the mean of its divisors is an integer number (29490492150).

Almost surely, 2^645566055340 is an apocalyptic number.

It is an amenable number.

645566055340 is an abundant number, since it is smaller than the sum of its proper divisors (769977567860).

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

645566055340 is a wasteful number, since it uses less digits than its factorization.

645566055340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10402434 (or 10402432 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 49.

The spelling of 645566055340 in words is "six hundred forty-five billion, five hundred sixty-six million, fifty-five thousand, three hundred forty".