81553415412 has 96 divisors (see below), whose sum is σ = 218521255680. Its totient is φ = 23189160960.

The previous prime is 81553415407. The next prime is 81553415429. The reversal of 81553415412 is 21451435518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33463458 + ... + 33465894.

It is an arithmetic number, because the mean of its divisors is an integer number (2276263080).

Almost surely, 2^81553415412 is an apocalyptic number.

It is an amenable number.

81553415412 is an abundant number, since it is smaller than the sum of its proper divisors (136967840268).

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

81553415412 is a wasteful number, since it uses less digits than its factorization.

81553415412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201 (or 4199 counting only the distinct ones).

The product of its digits is 96000, while the sum is 39.

The spelling of 81553415412 in words is "eighty-one billion, five hundred fifty-three million, four hundred fifteen thousand, four hundred twelve".