81416823278 has 48 divisors (see below), whose sum is σ = 154365120000. Its totient is φ = 31990094640.

The previous prime is 81416823239. The next prime is 81416823311. The reversal of 81416823278 is 87232861418.

It is a super-2 number, since 2×81416823278² (a number of 23 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 647528 + ... + 762971.

It is an arithmetic number, because the mean of its divisors is an integer number (3215940000).

Almost surely, 2^81416823278 is an apocalyptic number.

81416823278 is a deficient number, since it is larger than the sum of its proper divisors (72948296722).

81416823278 is a wasteful number, since it uses less digits than its factorization.

81416823278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410565 (or 1410558 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 50.

The spelling of 81416823278 in words is "eighty-one billion, four hundred sixteen million, eight hundred twenty-three thousand, two hundred seventy-eight".