81814397583490 has 64 divisors (see below), whose sum is σ = 173119237441920. Its totient is φ = 27445106787840.

The previous prime is 81814397583481. The next prime is 81814397583547. The reversal of 81814397583490 is 9438579341818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15478144 + ... + 20079883.

It is an arithmetic number, because the mean of its divisors is an integer number (2704988085030).

Almost surely, 2^{81814397583490} is an apocalyptic number.

81814397583490 is an abundant number, since it is smaller than the sum of its proper divisors (91304839858430).

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

81814397583490 is a wasteful number, since it uses less digits than its factorization.

81814397583490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35559667.

The product of its (nonzero) digits is 209018880, while the sum is 70.

The spelling of 81814397583490 in words is "eighty-one trillion, eight hundred fourteen billion, three hundred ninety-seven million, five hundred eighty-three thousand, four hundred ninety".