27343197981 has 12 divisors (see below), whose sum is σ = 43086251520. Its totient is φ = 16571635080.

The previous prime is 27343197941. The next prime is 27343197989. The reversal of 27343197981 is 18979134372.

27343197981 is a `hidden beast` number, since 27 + 343 + 197 + 98 + 1 = 666.

It is not a de Polignac number, because 27343197981 - 2¹¹ = 27343195933 is a prime.

It is a super-2 number, since 2×27343197981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27343197989) 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, 138096861 + ... + 138097058.

It is an arithmetic number, because the mean of its divisors is an integer number (3590520960).

Almost surely, 2^27343197981 is an apocalyptic number.

It is an amenable number.

27343197981 is a deficient number, since it is larger than the sum of its proper divisors (15743053539).

27343197981 is a wasteful number, since it uses less digits than its factorization.

27343197981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276193936 (or 276193933 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The spelling of 27343197981 in words is "twenty-seven billion, three hundred forty-three million, one hundred ninety-seven thousand, nine hundred eighty-one".