81400008160 has 24 divisors (see below), whose sum is σ = 192307519656. Its totient is φ = 32560003200.

The previous prime is 81400008127. The next prime is 81400008169. The reversal of 81400008160 is 6180000418.

It is a super-2 number, since 2×81400008160² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81400008169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254374866 + ... + 254375185.

It is an arithmetic number, because the mean of its divisors is an integer number (8012813319).

Almost surely, 2^81400008160 is an apocalyptic number.

81400008160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81400008160 is an abundant number, since it is smaller than the sum of its proper divisors (110907511496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81400008160 is a wasteful number, since it uses less digits than its factorization.

81400008160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508750066 (or 508750058 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

Adding to 81400008160 its reverse (6180000418), we get a palindrome (87580008578).

The spelling of 81400008160 in words is "eighty-one billion, four hundred million, eight thousand, one hundred sixty".