18671233980789 has 12 divisors (see below), whose sum is σ = 29044141748076. Its totient is φ = 11489990141952.

The previous prime is 18671233980767. The next prime is 18671233980907. The reversal of 18671233980789 is 98708933217681.

18671233980789 is a `hidden beast` number, since 1 + 86 + 71 + 2 + 339 + 80 + 78 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1966888441764 + 16704345539025 = 1402458^2 + 4087095^2 .

It is not a de Polignac number, because 18671233980789 - 2⁸ = 18671233980533 is a prime.

It is a super-2 number, since 2×18671233980789² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18671233910789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79791598092 + ... + 79791598325.

It is an arithmetic number, because the mean of its divisors is an integer number (2420345145673).

Almost surely, 2^{18671233980789} is an apocalyptic number.

It is an amenable number.

18671233980789 is a deficient number, since it is larger than the sum of its proper divisors (10372907767287).

18671233980789 is a wasteful number, since it uses less digits than its factorization.

18671233980789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159583196436 (or 159583196433 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 72.

The spelling of 18671233980789 in words is "eighteen trillion, six hundred seventy-one billion, two hundred thirty-three million, nine hundred eighty thousand, seven hundred eighty-nine".