23894578549 has 2 divisors, whose sum is σ = 23894578550. Its totient is φ = 23894578548.

The previous prime is 23894578469. The next prime is 23894578601. The reversal of 23894578549 is 94587549832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17957876049 + 5936702500 = 134007^2 + 77050^2 .

It is a cyclic number.

It is not a de Polignac number, because 23894578549 - 2²³ = 23886189941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23894578649) 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 as a sum of consecutive naturals, namely, 11947289274 + 11947289275.

It is an arithmetic number, because the mean of its divisors is an integer number (11947289275).

Almost surely, 2^23894578549 is an apocalyptic number.

It is an amenable number.

23894578549 is a deficient number, since it is larger than the sum of its proper divisors (1).

23894578549 is an equidigital number, since it uses as much as digits as its factorization.

23894578549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 64.

The spelling of 23894578549 in words is "twenty-three billion, eight hundred ninety-four million, five hundred seventy-eight thousand, five hundred forty-nine".