23220566505 has 24 divisors (see below), whose sum is σ = 40316901768. Its totient is φ = 12363403776.

The previous prime is 23220566503. The next prime is 23220566519. The reversal of 23220566505 is 50566502232.

23220566505 is a `hidden beast` number, since 23 + 2 + 20 + 566 + 50 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6067163664 + 17153402841 = 77892^2 + 130971^2 .

It is not a de Polignac number, because 23220566505 - 2¹ = 23220566503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23220566505.

It is not an unprimeable number, because it can be changed into a prime (23220566503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 408402 + ... + 461771.

It is an arithmetic number, because the mean of its divisors is an integer number (1679870907).

Almost surely, 2^23220566505 is an apocalyptic number.

It is an amenable number.

23220566505 is a deficient number, since it is larger than the sum of its proper divisors (17096335263).

23220566505 is a wasteful number, since it uses less digits than its factorization.

23220566505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870777 (or 870774 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 23220566505 in words is "twenty-three billion, two hundred twenty million, five hundred sixty-six thousand, five hundred five".