645395959 has 12 divisors (see below), whose sum is σ = 705798792. Its totient is φ = 589836000.

The previous prime is 645395941. The next prime is 645395977. The reversal of 645395959 is 959593546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645395941) and next prime (645395977).

It is not a de Polignac number, because 645395959 - 2⁹ = 645395447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645395459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1837 + ... + 35974.

It is an arithmetic number, because the mean of its divisors is an integer number (58816566).

Almost surely, 2^645395959 is an apocalyptic number.

645395959 is a deficient number, since it is larger than the sum of its proper divisors (60402833).

645395959 is a wasteful number, since it uses less digits than its factorization.

645395959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37938 (or 37925 counting only the distinct ones).

The product of its digits is 6561000, while the sum is 55.

The square root of 645395959 is about 25404.6444375827. The cubic root of 645395959 is about 864.1890264107.

The spelling of 645395959 in words is "six hundred forty-five million, three hundred ninety-five thousand, nine hundred fifty-nine".