23215205345 has 4 divisors (see below), whose sum is σ = 27858246420. Its totient is φ = 18572164272.

The previous prime is 23215205341. The next prime is 23215205353. The reversal of 23215205345 is 54350251232.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2539353664 + 20675851681 = 50392^2 + 143791^2 .

It is a cyclic number.

It is not a de Polignac number, because 23215205345 - 2² = 23215205341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23215205341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321520530 + ... + 2321520539.

It is an arithmetic number, because the mean of its divisors is an integer number (6964561605).

Almost surely, 2^23215205345 is an apocalyptic number.

It is an amenable number.

23215205345 is a deficient number, since it is larger than the sum of its proper divisors (4643041075).

23215205345 is an equidigital number, since it uses as much as digits as its factorization.

23215205345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4643041074.

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 23215205345 its reverse (54350251232), we get a palindrome (77565456577).

The spelling of 23215205345 in words is "twenty-three billion, two hundred fifteen million, two hundred five thousand, three hundred forty-five".