81499378882 has 16 divisors (see below), whose sum is σ = 126425896704. Its totient is φ = 39362274000.

The previous prime is 81499378871. The next prime is 81499378931. The reversal of 81499378882 is 28887399418.

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, 1181344 + ... + 1248427.

It is an arithmetic number, because the mean of its divisors is an integer number (7901618544).

Almost surely, 2^81499378882 is an apocalyptic number.

81499378882 is a deficient number, since it is larger than the sum of its proper divisors (44926517822).

81499378882 is a wasteful number, since it uses less digits than its factorization.

81499378882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430345.

The product of its digits is 55738368, while the sum is 67.

The spelling of 81499378882 in words is "eighty-one billion, four hundred ninety-nine million, three hundred seventy-eight thousand, eight hundred eighty-two".