18022793977 has 2 divisors, whose sum is σ = 18022793978. Its totient is φ = 18022793976.

The previous prime is 18022793969. The next prime is 18022794011. The reversal of 18022793977 is 77939722081.

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., 10071326736 + 7951467241 = 100356^2 + 89171^2 .

It is a cyclic number.

It is not a de Polignac number, because 18022793977 - 2³ = 18022793969 is a prime.

It is a super-2 number, since 2×18022793977² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18022793917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9011396988 + 9011396989.

It is an arithmetic number, because the mean of its divisors is an integer number (9011396989).

Almost surely, 2^18022793977 is an apocalyptic number.

It is an amenable number.

18022793977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18022793977 is an equidigital number, since it uses as much as digits as its factorization.

18022793977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 18022793977 in words is "eighteen billion, twenty-two million, seven hundred ninety-three thousand, nine hundred seventy-seven".