645163123 has 8 divisors (see below), whose sum is σ = 713456496. Its totient is φ = 578476800.

The previous prime is 645163111. The next prime is 645163139. The reversal of 645163123 is 321361546.

645163123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-645163123 is a prime.

It is a super-2 number, since 2×645163123² = 832470910558226258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645163523) 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, 400918 + ... + 402523.

It is an arithmetic number, because the mean of its divisors is an integer number (89182062).

Almost surely, 2^645163123 is an apocalyptic number.

645163123 is a deficient number, since it is larger than the sum of its proper divisors (68293373).

645163123 is a wasteful number, since it uses less digits than its factorization.

645163123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803525.

The product of its digits is 12960, while the sum is 31.

The square root of 645163123 is about 25400.0614763036. The cubic root of 645163123 is about 864.0850909815.

The spelling of 645163123 in words is "six hundred forty-five million, one hundred sixty-three thousand, one hundred twenty-three".