23643640357 has 2 divisors, whose sum is σ = 23643640358. Its totient is φ = 23643640356.

The previous prime is 23643640333. The next prime is 23643640369. The reversal of 23643640357 is 75304634632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13108876036 + 10534764321 = 114494^2 + 102639^2 .

It is a cyclic number.

It is not a de Polignac number, because 23643640357 - 2³¹ = 21496156709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23646640357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11821820178 + 11821820179.

It is an arithmetic number, because the mean of its divisors is an integer number (11821820179).

Almost surely, 2^23643640357 is an apocalyptic number.

It is an amenable number.

23643640357 is a deficient number, since it is larger than the sum of its proper divisors (1).

23643640357 is an equidigital number, since it uses as much as digits as its factorization.

23643640357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 43.

The spelling of 23643640357 in words is "twenty-three billion, six hundred forty-three million, six hundred forty thousand, three hundred fifty-seven".