23855240861 has 2 divisors, whose sum is σ = 23855240862. Its totient is φ = 23855240860.

The previous prime is 23855240729. The next prime is 23855240879. The reversal of 23855240861 is 16804255832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23783499961 + 71740900 = 154219^2 + 8470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23855240861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23855240561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11927620430 + 11927620431.

It is an arithmetic number, because the mean of its divisors is an integer number (11927620431).

Almost surely, 2^23855240861 is an apocalyptic number.

It is an amenable number.

23855240861 is a deficient number, since it is larger than the sum of its proper divisors (1).

23855240861 is an equidigital number, since it uses as much as digits as its factorization.

23855240861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 23855240861 in words is "twenty-three billion, eight hundred fifty-five million, two hundred forty thousand, eight hundred sixty-one".