645622521613 has 16 divisors (see below), whose sum is σ = 694559387520. Its totient is φ = 597923099136.

The previous prime is 645622521587. The next prime is 645622521671. The reversal of 645622521613 is 316125226546.

645622521613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645622521613 - 2⁹ = 645622521101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645622521613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645622521673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 738345 + ... + 1355137.

It is an arithmetic number, because the mean of its divisors is an integer number (43409961720).

Almost surely, 2^645622521613 is an apocalyptic number.

It is an amenable number.

645622521613 is a deficient number, since it is larger than the sum of its proper divisors (48936865907).

645622521613 is a wasteful number, since it uses less digits than its factorization.

645622521613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617796.

The product of its digits is 518400, while the sum is 43.

The spelling of 645622521613 in words is "six hundred forty-five billion, six hundred twenty-two million, five hundred twenty-one thousand, six hundred thirteen".