645168743 has 8 divisors (see below), whose sum is σ = 668334240. Its totient is φ = 622357120.

The previous prime is 645168707. The next prime is 645168749. The reversal of 645168743 is 347861546.

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-645168743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645168694 and 645168703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645168749) 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, 84755 + ... + 92052.

It is an arithmetic number, because the mean of its divisors is an integer number (83541780).

Almost surely, 2^645168743 is an apocalyptic number.

645168743 is a deficient number, since it is larger than the sum of its proper divisors (23165497).

645168743 is a wasteful number, since it uses less digits than its factorization.

645168743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176937.

The product of its digits is 483840, while the sum is 44.

The square root of 645168743 is about 25400.1721057161. The cubic root of 645168743 is about 864.0875999822.

The spelling of 645168743 in words is "six hundred forty-five million, one hundred sixty-eight thousand, seven hundred forty-three".