645236545530 has 16 divisors (see below), whose sum is σ = 1548567709344. Its totient is φ = 172063078800.

The previous prime is 645236545493. The next prime is 645236545571. The reversal of 645236545530 is 35545632546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645236545530.

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, 10753942396 + ... + 10753942455.

It is an arithmetic number, because the mean of its divisors is an integer number (96785481834).

Almost surely, 2^645236545530 is an apocalyptic number.

645236545530 is an abundant number, since it is smaller than the sum of its proper divisors (903331163814).

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

645236545530 is a wasteful number, since it uses less digits than its factorization.

645236545530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21507884861.

The product of its (nonzero) digits is 6480000, while the sum is 48.

The spelling of 645236545530 in words is "six hundred forty-five billion, two hundred thirty-six million, five hundred forty-five thousand, five hundred thirty".