645965759807 has 8 divisors (see below), whose sum is σ = 683980538256. Its totient is φ = 607952847232.

The previous prime is 645965759797. The next prime is 645965759827. The reversal of 645965759807 is 708957569546.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645965759807 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 (645965759827) 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, 280493 + ... + 1170729.

It is an arithmetic number, because the mean of its divisors is an integer number (85497567282).

Almost surely, 2^645965759807 is an apocalyptic number.

645965759807 is a deficient number, since it is larger than the sum of its proper divisors (38014778449).

645965759807 is a wasteful number, since it uses less digits than its factorization.

645965759807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932937.

The product of its (nonzero) digits is 571536000, while the sum is 71.

The spelling of 645965759807 in words is "six hundred forty-five billion, nine hundred sixty-five million, seven hundred fifty-nine thousand, eight hundred seven".