23138643587 has 2 divisors, whose sum is σ = 23138643588. Its totient is φ = 23138643586.

The previous prime is 23138643559. The next prime is 23138643599. The reversal of 23138643587 is 78534683132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23138643587 - 2⁸ = 23138643331 is a prime.

It is not a weakly prime, because it can be changed into another prime (23138640587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11569321793 + 11569321794.

It is an arithmetic number, because the mean of its divisors is an integer number (11569321794).

Almost surely, 2^23138643587 is an apocalyptic number.

23138643587 is a deficient number, since it is larger than the sum of its proper divisors (1).

23138643587 is an equidigital number, since it uses as much as digits as its factorization.

23138643587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 50.

The spelling of 23138643587 in words is "twenty-three billion, one hundred thirty-eight million, six hundred forty-three thousand, five hundred eighty-seven".