81338416358 has 16 divisors (see below), whose sum is σ = 130237943040. Its totient is φ = 37986064200.

The previous prime is 81338416337. The next prime is 81338416361. The reversal of 81338416358 is 85361483318.

It is a congruent number.

It is an unprimeable number.

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, 15071138 + ... + 15076533.

It is an arithmetic number, because the mean of its divisors is an integer number (8139871440).

Almost surely, 2^81338416358 is an apocalyptic number.

81338416358 is a deficient number, since it is larger than the sum of its proper divisors (48899526682).

81338416358 is a wasteful number, since it uses less digits than its factorization.

81338416358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30147763.

The product of its digits is 1658880, while the sum is 50.

The spelling of 81338416358 in words is "eighty-one billion, three hundred thirty-eight million, four hundred sixteen thousand, three hundred fifty-eight".