81041687999 has 8 divisors (see below), whose sum is σ = 81103779792. Its totient is φ = 80979624640.

The previous prime is 81041687977. The next prime is 81041688029. The reversal of 81041687999 is 99978614018.

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

It is a cyclic number.

It is not a de Polignac number, because 81041687999 - 2²⁰ = 81040639423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81041687959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11552417 + ... + 11559429.

It is an arithmetic number, because the mean of its divisors is an integer number (10137972474).

Almost surely, 2^81041687999 is an apocalyptic number.

81041687999 is a deficient number, since it is larger than the sum of its proper divisors (62091793).

81041687999 is a wasteful number, since it uses less digits than its factorization.

81041687999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14217.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The spelling of 81041687999 in words is "eighty-one billion, forty-one million, six hundred eighty-seven thousand, nine hundred ninety-nine".