23705729561 has 4 divisors (see below), whose sum is σ = 23752858752. Its totient is φ = 23658600372.

The previous prime is 23705729549. The next prime is 23705729573. The reversal of 23705729561 is 16592750732.

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 an interprime number because it is at equal distance from previous prime (23705729549) and next prime (23705729573).

It is a cyclic number.

It is not a de Polignac number, because 23705729561 - 2²² = 23701535257 is a prime.

It is a super-2 number, since 2×23705729561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23705729501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23563841 + ... + 23564846.

It is an arithmetic number, because the mean of its divisors is an integer number (5938214688).

Almost surely, 2^23705729561 is an apocalyptic number.

It is an amenable number.

23705729561 is a deficient number, since it is larger than the sum of its proper divisors (47129191).

23705729561 is an equidigital number, since it uses as much as digits as its factorization.

23705729561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47129190.

The product of its (nonzero) digits is 793800, while the sum is 47.

The spelling of 23705729561 in words is "twenty-three billion, seven hundred five million, seven hundred twenty-nine thousand, five hundred sixty-one".