28080166981 has 2 divisors, whose sum is σ = 28080166982. Its totient is φ = 28080166980.

The previous prime is 28080166973. The next prime is 28080167023. The reversal of 28080166981 is 18966108082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27999328900 + 80838081 = 167330^2 + 8991^2 .

It is a cyclic number.

It is not a de Polignac number, because 28080166981 - 2³ = 28080166973 is a prime.

It is a super-2 number, since 2×28080166981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28080166901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040083490 + 14040083491.

It is an arithmetic number, because the mean of its divisors is an integer number (14040083491).

Almost surely, 2^28080166981 is an apocalyptic number.

It is an amenable number.

28080166981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28080166981 is an equidigital number, since it uses as much as digits as its factorization.

28080166981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 28080166981 in words is "twenty-eight billion, eighty million, one hundred sixty-six thousand, nine hundred eighty-one".