81400980940 has 12 divisors (see below), whose sum is σ = 170942060016. Its totient is φ = 32560392368.

The previous prime is 81400980887. The next prime is 81400980943. The reversal of 81400980940 is 4908900418.

It is a super-2 number, since 2×81400980940² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81400980943) 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, 2035024504 + ... + 2035024543.

It is an arithmetic number, because the mean of its divisors is an integer number (14245171668).

Almost surely, 2^81400980940 is an apocalyptic number.

It is an amenable number.

81400980940 is an abundant number, since it is smaller than the sum of its proper divisors (89541079076).

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

81400980940 is a wasteful number, since it uses less digits than its factorization.

81400980940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070049056 (or 4070049054 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 81400980940 in words is "eighty-one billion, four hundred million, nine hundred eighty thousand, nine hundred forty".