23504513181661 has 4 divisors (see below), whose sum is σ = 23504525920800. Its totient is φ = 23504500442524.

The previous prime is 23504513181647. The next prime is 23504513181683. The reversal of 23504513181661 is 16618131540532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23504513181661 - 2³⁵ = 23470153443293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23504513181161) 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, 3012031 + ... + 7488748.

It is an arithmetic number, because the mean of its divisors is an integer number (5876131480200).

Almost surely, 2^{23504513181661} is an apocalyptic number.

It is an amenable number.

23504513181661 is a deficient number, since it is larger than the sum of its proper divisors (12739139).

23504513181661 is a wasteful number, since it uses less digits than its factorization.

23504513181661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12739138.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 23504513181661 in words is "twenty-three trillion, five hundred four billion, five hundred thirteen million, one hundred eighty-one thousand, six hundred sixty-one".