645065305125 has 64 divisors (see below), whose sum is σ = 1115982137088. Its totient is φ = 330633600000.

The previous prime is 645065305121. The next prime is 645065305139. The reversal of 645065305125 is 521503560546.

It is not a de Polignac number, because 645065305125 - 2² = 645065305121 is a prime.

It is a super-2 number, since 2×645065305125² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645065305121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 717025 + ... + 1343225.

It is an arithmetic number, because the mean of its divisors is an integer number (17437220892).

Almost surely, 2^645065305125 is an apocalyptic number.

It is an amenable number.

645065305125 is a deficient number, since it is larger than the sum of its proper divisors (470916831963).

645065305125 is a wasteful number, since it uses less digits than its factorization.

645065305125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626327 (or 626317 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 645065305125 in words is "six hundred forty-five billion, sixty-five million, three hundred five thousand, one hundred twenty-five".