23861507861 has 4 divisors (see below), whose sum is σ = 23892537900. Its totient is φ = 23830477824.

The previous prime is 23861507833. The next prime is 23861507863. The reversal of 23861507861 is 16870516832.

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 10018808836 + 13842699025 = 100094^2 + 117655^2 .

It is a cyclic number.

It is not a de Polignac number, because 23861507861 - 2⁶ = 23861507797 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 (23861507863) 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, 15513866 + ... + 15515403.

It is an arithmetic number, because the mean of its divisors is an integer number (5973134475).

Almost surely, 2^23861507861 is an apocalyptic number.

It is an amenable number.

23861507861 is a deficient number, since it is larger than the sum of its proper divisors (31030039).

23861507861 is an equidigital number, since it uses as much as digits as its factorization.

23861507861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31030038.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 23861507861 in words is "twenty-three billion, eight hundred sixty-one million, five hundred seven thousand, eight hundred sixty-one".