81418983979012 has 24 divisors (see below), whose sum is σ = 145430738016480. Its totient is φ = 39875894266560.

The previous prime is 81418983979007. The next prime is 81418983979013. The reversal of 81418983979012 is 21097938981418.

It is a super-2 number, since 2×81418983979012² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81418983979013) 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 7 ways as a sum of consecutive naturals, for example, 1068676914 + ... + 1068753097.

It is an arithmetic number, because the mean of its divisors is an integer number (6059614084020).

Almost surely, 2^{81418983979012} is an apocalyptic number.

It is an amenable number.

81418983979012 is a deficient number, since it is larger than the sum of its proper divisors (64011754037468).

81418983979012 is a wasteful number, since it uses less digits than its factorization.

81418983979012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137430211 (or 2137430209 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 70.

The spelling of 81418983979012 in words is "eighty-one trillion, four hundred eighteen billion, nine hundred eighty-three million, nine hundred seventy-nine thousand, twelve".