22661599 has 2 divisors, whose sum is σ = 22661600. Its totient is φ = 22661598.

The previous prime is 22661593. The next prime is 22661603. The reversal of 22661599 is 99516622.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22661599 - 2³ = 22661591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22661591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11330799 + 11330800.

It is an arithmetic number, because the mean of its divisors is an integer number (11330800).

Almost surely, 2^22661599 is an apocalyptic number.

22661599 is a deficient number, since it is larger than the sum of its proper divisors (1).

22661599 is an equidigital number, since it uses as much as digits as its factorization.

22661599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 22661599 is about 4760.4200444919. The cubic root of 22661599 is about 282.9850658253.

The spelling of 22661599 in words is "twenty-two million, six hundred sixty-one thousand, five hundred ninety-nine".