645566116433 has 4 divisors (see below), whose sum is σ = 737789847360. Its totient is φ = 553342385508.

The previous prime is 645566116417. The next prime is 645566116441. The reversal of 645566116433 is 334611665546.

645566116433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645566116433 - 2⁴ = 645566116417 is a prime.

It is a super-2 number, since 2×645566116433² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645566116933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46111865453 + ... + 46111865466.

It is an arithmetic number, because the mean of its divisors is an integer number (184447461840).

Almost surely, 2^645566116433 is an apocalyptic number.

It is an amenable number.

645566116433 is a deficient number, since it is larger than the sum of its proper divisors (92223730927).

645566116433 is an equidigital number, since it uses as much as digits as its factorization.

645566116433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92223730926.

The product of its digits is 4665600, while the sum is 50.

The spelling of 645566116433 in words is "six hundred forty-five billion, five hundred sixty-six million, one hundred sixteen thousand, four hundred thirty-three".