81116414157887 has 4 divisors (see below), whose sum is σ = 81116440309080. Its totient is φ = 81116388006696.

The previous prime is 81116414157833. The next prime is 81116414157893. The reversal of 81116414157887 is 78875141461118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81116414157887 - 2¹² = 81116414153791 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 (81116414157187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7680968 + ... + 14873805.

It is an arithmetic number, because the mean of its divisors is an integer number (20279110077270).

Almost surely, 2^{81116414157887} is an apocalyptic number.

81116414157887 is a deficient number, since it is larger than the sum of its proper divisors (26151193).

81116414157887 is a wasteful number, since it uses less digits than its factorization.

81116414157887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26151192.

The product of its digits is 12042240, while the sum is 62.

The spelling of 81116414157887 in words is "eighty-one trillion, one hundred sixteen billion, four hundred fourteen million, one hundred fifty-seven thousand, eight hundred eighty-seven".