645026717730 has 32 divisors (see below), whose sum is σ = 1548108707904. Its totient is φ = 172002170816.

The previous prime is 645026717659. The next prime is 645026717743. The reversal of 645026717730 is 37717620546.

It is a self number, because there is not a number n which added to its sum of digits gives 645026717730.

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, 816532 + ... + 1398848.

It is an arithmetic number, because the mean of its divisors is an integer number (48378397122).

Almost surely, 2^645026717730 is an apocalyptic number.

645026717730 is an abundant number, since it is smaller than the sum of its proper divisors (903081990174).

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

645026717730 is a wasteful number, since it uses less digits than its factorization.

645026717730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619250.

The product of its (nonzero) digits is 1481760, while the sum is 48.

The spelling of 645026717730 in words is "six hundred forty-five billion, twenty-six million, seven hundred seventeen thousand, seven hundred thirty".