645795023 has 8 divisors (see below), whose sum is σ = 651442176. Its totient is φ = 640159000.

The previous prime is 645795013. The next prime is 645795071. The reversal of 645795023 is 320597546.

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

It is a cyclic number.

It is not a de Polignac number, because 645795023 - 2¹² = 645790927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645795013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148640 + ... + 152922.

It is an arithmetic number, because the mean of its divisors is an integer number (81430272).

Almost surely, 2^645795023 is an apocalyptic number.

645795023 is a deficient number, since it is larger than the sum of its proper divisors (5647153).

645795023 is a wasteful number, since it uses less digits than its factorization.

645795023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5565.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 645795023 is about 25412.4973782586. The cubic root of 645795023 is about 864.3671060684.

The spelling of 645795023 in words is "six hundred forty-five million, seven hundred ninety-five thousand, twenty-three".