81411982906 has 8 divisors (see below), whose sum is σ = 122119591284. Its totient is φ = 40705452480.

The previous prime is 81411982889. The next prime is 81411982979. The reversal of 81411982906 is 60928911418.

It can be written as a sum of positive squares in 2 ways, for example, as 80717923881 + 694059025 = 284109^2 + 26345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81411982906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42405 + ... + 405736.

Almost surely, 2^81411982906 is an apocalyptic number.

81411982906 is a deficient number, since it is larger than the sum of its proper divisors (40707608378).

81411982906 is a wasteful number, since it uses less digits than its factorization.

81411982906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538976.

The product of its (nonzero) digits is 248832, while the sum is 49.

The spelling of 81411982906 in words is "eighty-one billion, four hundred eleven million, nine hundred eighty-two thousand, nine hundred six".