23533503661 has 2 divisors, whose sum is σ = 23533503662. Its totient is φ = 23533503660.

The previous prime is 23533503659. The next prime is 23533503671. The reversal of 23533503661 is 16630533532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20500798761 + 3032704900 = 143181^2 + 55070^2 .

It is a cyclic number.

It is not a de Polignac number, because 23533503661 - 2¹ = 23533503659 is a prime.

Together with 23533503659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 23533503661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23533503611) 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 as a sum of consecutive naturals, namely, 11766751830 + 11766751831.

It is an arithmetic number, because the mean of its divisors is an integer number (11766751831).

Almost surely, 2^23533503661 is an apocalyptic number.

It is an amenable number.

23533503661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23533503661 is an equidigital number, since it uses as much as digits as its factorization.

23533503661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 37.

The spelling of 23533503661 in words is "twenty-three billion, five hundred thirty-three million, five hundred three thousand, six hundred sixty-one".