18228223577 has 2 divisors, whose sum is σ = 18228223578. Its totient is φ = 18228223576.

The previous prime is 18228223537. The next prime is 18228223639. The reversal of 18228223577 is 77532282281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11608123081 + 6620100496 = 107741^2 + 81364^2 .

It is a cyclic number.

It is not a de Polignac number, because 18228223577 - 2¹² = 18228219481 is a prime.

It is not a weakly prime, because it can be changed into another prime (18228223537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114111788 + 9114111789.

It is an arithmetic number, because the mean of its divisors is an integer number (9114111789).

Almost surely, 2^18228223577 is an apocalyptic number.

It is an amenable number.

18228223577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18228223577 is an equidigital number, since it uses as much as digits as its factorization.

18228223577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 47.

The spelling of 18228223577 in words is "eighteen billion, two hundred twenty-eight million, two hundred twenty-three thousand, five hundred seventy-seven".