645609332592 has 120 divisors (see below), whose sum is σ = 2076461562240. Its totient is φ = 183429256320.

The previous prime is 645609332527. The next prime is 645609332603. The reversal of 645609332592 is 295233906546.

It is a happy number.

645609332592 is a `hidden beast` number, since 6 + 4 + 5 + 609 + 3 + 3 + 25 + 9 + 2 = 666.

It is a super-2 number, since 2×645609332592² (a number of 24 digits) contains 22 as substring.

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, 1608634 + ... + 1969497.

It is an arithmetic number, because the mean of its divisors is an integer number (17303846352).

Almost surely, 2^645609332592 is an apocalyptic number.

It is an amenable number.

645609332592 is an abundant number, since it is smaller than the sum of its proper divisors (1430852229648).

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

645609332592 is a wasteful number, since it uses less digits than its factorization.

645609332592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578331 (or 3578322 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 54.

The spelling of 645609332592 in words is "six hundred forty-five billion, six hundred nine million, three hundred thirty-two thousand, five hundred ninety-two".