645646026305 has 8 divisors (see below), whose sum is σ = 885457407552. Its totient is φ = 442728703728.

The previous prime is 645646026293. The next prime is 645646026343. The reversal of 645646026305 is 503620646546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645646026305 - 2⁸ = 645646026049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645646026305.

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, 9223514627 + ... + 9223514696.

It is an arithmetic number, because the mean of its divisors is an integer number (110682175944).

Almost surely, 2^645646026305 is an apocalyptic number.

It is an amenable number.

645646026305 is a deficient number, since it is larger than the sum of its proper divisors (239811381247).

645646026305 is a wasteful number, since it uses less digits than its factorization.

645646026305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18447029335.

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 645646026305 in words is "six hundred forty-five billion, six hundred forty-six million, twenty-six thousand, three hundred five".