645344665763 has 8 divisors (see below), whose sum is σ = 737544767232. Its totient is φ = 553146565896.

The previous prime is 645344665717. The next prime is 645344665789. The reversal of 645344665763 is 367566443546.

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-645344665763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645344665703) 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, 269456 + ... + 1167602.

It is an arithmetic number, because the mean of its divisors is an integer number (92193095904).

Almost surely, 2^645344665763 is an apocalyptic number.

645344665763 is a deficient number, since it is larger than the sum of its proper divisors (92200101469).

645344665763 is a wasteful number, since it uses less digits than its factorization.

645344665763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000801.

The product of its digits is 130636800, while the sum is 59.

The spelling of 645344665763 in words is "six hundred forty-five billion, three hundred forty-four million, six hundred sixty-five thousand, seven hundred sixty-three".