645052223525 has 24 divisors (see below), whose sum is σ = 808722550944. Its totient is φ = 510353979200.

The previous prime is 645052223489. The next prime is 645052223537. The reversal of 645052223525 is 525322250546.

It is not a de Polignac number, because 645052223525 - 2²² = 645048029221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 623462 + ... + 1295688.

It is an arithmetic number, because the mean of its divisors is an integer number (33696772956).

Almost surely, 2^645052223525 is an apocalyptic number.

It is an amenable number.

645052223525 is a deficient number, since it is larger than the sum of its proper divisors (163670327419).

645052223525 is a wasteful number, since it uses less digits than its factorization.

645052223525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672661 (or 672656 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 41.

The spelling of 645052223525 in words is "six hundred forty-five billion, fifty-two million, two hundred twenty-three thousand, five hundred twenty-five".