18220177337 has 2 divisors, whose sum is σ = 18220177338. Its totient is φ = 18220177336.

The previous prime is 18220177331. The next prime is 18220177387. The reversal of 18220177337 is 73377102281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16924969216 + 1295208121 = 130096^2 + 35989^2 .

It is a cyclic number.

It is not a de Polignac number, because 18220177337 - 2⁶ = 18220177273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18220177294 and 18220177303.

It is not a weakly prime, because it can be changed into another prime (18220177331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110088668 + 9110088669.

It is an arithmetic number, because the mean of its divisors is an integer number (9110088669).

Almost surely, 2^18220177337 is an apocalyptic number.

It is an amenable number.

18220177337 is a deficient number, since it is larger than the sum of its proper divisors (1).

18220177337 is an equidigital number, since it uses as much as digits as its factorization.

18220177337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 18220177337 in words is "eighteen billion, two hundred twenty million, one hundred seventy-seven thousand, three hundred thirty-seven".