645234562523 has 8 divisors (see below), whose sum is σ = 683692254720. Its totient is φ = 607226668200.

The previous prime is 645234562501. The next prime is 645234562571. The reversal of 645234562523 is 325265432546.

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-645234562523 is a prime.

It is a super-2 number, since 2×645234562523² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645234562723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112446515 + ... + 112452252.

It is an arithmetic number, because the mean of its divisors is an integer number (85461531840).

Almost surely, 2^645234562523 is an apocalyptic number.

645234562523 is a deficient number, since it is larger than the sum of its proper divisors (38457692197).

645234562523 is a wasteful number, since it uses less digits than its factorization.

645234562523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224898937.

The product of its digits is 5184000, while the sum is 47.

The spelling of 645234562523 in words is "six hundred forty-five billion, two hundred thirty-four million, five hundred sixty-two thousand, five hundred twenty-three".