81886887827 has 8 divisors (see below), whose sum is σ = 83638460400. Its totient is φ = 80147437344.

The previous prime is 81886887809. The next prime is 81886887853. The reversal of 81886887827 is 72878868818.

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 81886887827 - 2¹² = 81886883731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81886887877) 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, 3016868 + ... + 3043889.

It is an arithmetic number, because the mean of its divisors is an integer number (10454807550).

Almost surely, 2^81886887827 is an apocalyptic number.

81886887827 is a deficient number, since it is larger than the sum of its proper divisors (1751572573).

81886887827 is a wasteful number, since it uses less digits than its factorization.

81886887827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061045.

The product of its digits is 154140672, while the sum is 71.

The spelling of 81886887827 in words is "eighty-one billion, eight hundred eighty-six million, eight hundred eighty-seven thousand, eight hundred twenty-seven".