23193688649 has 2 divisors, whose sum is σ = 23193688650. Its totient is φ = 23193688648.

The previous prime is 23193688571. The next prime is 23193688663. The reversal of 23193688649 is 94688639132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21172287049 + 2021401600 = 145507^2 + 44960^2 .

It is a cyclic number.

It is not a de Polignac number, because 23193688649 - 2²⁸ = 22925253193 is a prime.

It is not a weakly prime, because it can be changed into another prime (23193688849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11596844324 + 11596844325.

It is an arithmetic number, because the mean of its divisors is an integer number (11596844325).

Almost surely, 2^23193688649 is an apocalyptic number.

It is an amenable number.

23193688649 is a deficient number, since it is larger than the sum of its proper divisors (1).

23193688649 is an equidigital number, since it uses as much as digits as its factorization.

23193688649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 59.

The spelling of 23193688649 in words is "twenty-three billion, one hundred ninety-three million, six hundred eighty-eight thousand, six hundred forty-nine".