18077320069 has 2 divisors, whose sum is σ = 18077320070. Its totient is φ = 18077320068.

The previous prime is 18077320061. The next prime is 18077320109. The reversal of 18077320069 is 96002377081.

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., 18073575844 + 3744225 = 134438^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 18077320069 - 2³ = 18077320061 is a prime.

It is a super-2 number, since 2×18077320069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18077320061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9038660034 + 9038660035.

It is an arithmetic number, because the mean of its divisors is an integer number (9038660035).

Almost surely, 2^18077320069 is an apocalyptic number.

It is an amenable number.

18077320069 is a deficient number, since it is larger than the sum of its proper divisors (1).

18077320069 is an equidigital number, since it uses as much as digits as its factorization.

18077320069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 18077320069 in words is "eighteen billion, seventy-seven million, three hundred twenty thousand, sixty-nine".