23661142111 has 4 divisors (see below), whose sum is σ = 24906465400. Its totient is φ = 22415818824.

The previous prime is 23661142097. The next prime is 23661142121. The reversal of 23661142111 is 11124116632.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23661142111 - 2¹⁵ = 23661109343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23661142111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23661142121) 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, 622661616 + ... + 622661653.

It is an arithmetic number, because the mean of its divisors is an integer number (6226616350).

Almost surely, 2^23661142111 is an apocalyptic number.

23661142111 is a deficient number, since it is larger than the sum of its proper divisors (1245323289).

23661142111 is a wasteful number, since it uses less digits than its factorization.

23661142111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245323288.

The product of its digits is 1728, while the sum is 28.

Adding to 23661142111 its reverse (11124116632), we get a palindrome (34785258743).

The spelling of 23661142111 in words is "twenty-three billion, six hundred sixty-one million, one hundred forty-two thousand, one hundred eleven".