645233023 has 4 divisors (see below), whose sum is σ = 648475600. Its totient is φ = 641990448.

The previous prime is 645232993. The next prime is 645233081. The reversal of 645233023 is 320332546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645233023 - 2²⁵ = 611678591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645232982 and 645233000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645233423) 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, 1620990 + ... + 1621387.

It is an arithmetic number, because the mean of its divisors is an integer number (162118900).

Almost surely, 2^645233023 is an apocalyptic number.

645233023 is a deficient number, since it is larger than the sum of its proper divisors (3242577).

645233023 is a wasteful number, since it uses less digits than its factorization.

645233023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242576.

The product of its (nonzero) digits is 12960, while the sum is 28.

The square root of 645233023 is about 25401.4374199572. The cubic root of 645233023 is about 864.1162961990.

Adding to 645233023 its reverse (320332546), we get a palindrome (965565569).

The spelling of 645233023 in words is "six hundred forty-five million, two hundred thirty-three thousand, twenty-three".