23215317533 has 2 divisors, whose sum is σ = 23215317534. Its totient is φ = 23215317532.

The previous prime is 23215317497. The next prime is 23215317553. The reversal of 23215317533 is 33571351232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23214179044 + 1138489 = 152362^2 + 1067^2 .

It is a cyclic number.

It is not a de Polignac number, because 23215317533 - 2²⁶ = 23148208669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23215317493 and 23215317502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23215317553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11607658766 + 11607658767.

It is an arithmetic number, because the mean of its divisors is an integer number (11607658767).

Almost surely, 2^23215317533 is an apocalyptic number.

It is an amenable number.

23215317533 is a deficient number, since it is larger than the sum of its proper divisors (1).

23215317533 is an equidigital number, since it uses as much as digits as its factorization.

23215317533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 35.

Adding to 23215317533 its reverse (33571351232), we get a palindrome (56786668765).

The spelling of 23215317533 in words is "twenty-three billion, two hundred fifteen million, three hundred seventeen thousand, five hundred thirty-three".