23145531533 has 4 divisors (see below), whose sum is σ = 23943653340. Its totient is φ = 22347409728.

The previous prime is 23145531527. The next prime is 23145531551. The reversal of 23145531533 is 33513554132.

It is a happy number.

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 12949984804 + 10195546729 = 113798^2 + 100973^2 .

It is a cyclic number.

It is not a de Polignac number, because 23145531533 - 2⁴ = 23145531517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23145531493 and 23145531502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23145531133) 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, 399060860 + ... + 399060917.

It is an arithmetic number, because the mean of its divisors is an integer number (5985913335).

Almost surely, 2^23145531533 is an apocalyptic number.

It is an amenable number.

23145531533 is a deficient number, since it is larger than the sum of its proper divisors (798121807).

23145531533 is an equidigital number, since it uses as much as digits as its factorization.

23145531533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798121806.

The product of its digits is 81000, while the sum is 35.

The spelling of 23145531533 in words is "twenty-three billion, one hundred forty-five million, five hundred thirty-one thousand, five hundred thirty-three".