645516213125 has 40 divisors (see below), whose sum is σ = 923891010240. Its totient is φ = 441669744000.

The previous prime is 645516213103. The next prime is 645516213191. The reversal of 645516213125 is 521312615546.

It is not a de Polignac number, because 645516213125 - 2²⁰ = 645515164549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1837946 + ... + 2160804.

It is an arithmetic number, because the mean of its divisors is an integer number (23097275256).

Almost surely, 2^645516213125 is an apocalyptic number.

It is an amenable number.

645516213125 is a deficient number, since it is larger than the sum of its proper divisors (278374797115).

645516213125 is an equidigital number, since it uses as much as digits as its factorization.

645516213125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323343 (or 323328 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The spelling of 645516213125 in words is "six hundred forty-five billion, five hundred sixteen million, two hundred thirteen thousand, one hundred twenty-five".