81399608854 has 16 divisors (see below), whose sum is σ = 127030542336. Its totient is φ = 39076770600.

The previous prime is 81399608819. The next prime is 81399608861. The reversal of 81399608854 is 45880699318.

It is a super-4 number, since 4×81399608854⁴ (a number of 45 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81399608792 and 81399608801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5161012 + ... + 5176759.

It is an arithmetic number, because the mean of its divisors is an integer number (7939408896).

Almost surely, 2^81399608854 is an apocalyptic number.

81399608854 is a deficient number, since it is larger than the sum of its proper divisors (45630933482).

81399608854 is a wasteful number, since it uses less digits than its factorization.

81399608854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10337931.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 81399608854 in words is "eighty-one billion, three hundred ninety-nine million, six hundred eight thousand, eight hundred fifty-four".