23217591645 has 48 divisors (see below), whose sum is σ = 43033144752. Its totient is φ = 11538892800.

The previous prime is 23217591641. The next prime is 23217591689. The reversal of 23217591645 is 54619571232.

23217591645 is a `hidden beast` number, since 2 + 3 + 2 + 17 + 591 + 6 + 45 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 60516 + 23217531129 = 246^2 + 152373^2 .

It is not a de Polignac number, because 23217591645 - 2² = 23217591641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 23217591645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23217591641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72982 + ... + 227511.

It is an arithmetic number, because the mean of its divisors is an integer number (896523849).

Almost surely, 2^23217591645 is an apocalyptic number.

It is an amenable number.

23217591645 is a deficient number, since it is larger than the sum of its proper divisors (19815553107).

23217591645 is a wasteful number, since it uses less digits than its factorization.

23217591645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300622 (or 300619 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 23217591645 in words is "twenty-three billion, two hundred seventeen million, five hundred ninety-one thousand, six hundred forty-five".