645599513 has 8 divisors (see below), whose sum is σ = 697908288. Its totient is φ = 593668944.

The previous prime is 645599509. The next prime is 645599527. The reversal of 645599513 is 315995546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645599513 - 2² = 645599509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645599533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90995 + ... + 97832.

It is an arithmetic number, because the mean of its divisors is an integer number (87238536).

Almost surely, 2^645599513 is an apocalyptic number.

It is an amenable number.

645599513 is a deficient number, since it is larger than the sum of its proper divisors (52308775).

645599513 is a wasteful number, since it uses less digits than its factorization.

645599513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189103.

The product of its digits is 729000, while the sum is 47.

The square root of 645599513 is about 25408.6503577030. The cubic root of 645599513 is about 864.2798701996.

The spelling of 645599513 in words is "six hundred forty-five million, five hundred ninety-nine thousand, five hundred thirteen".