81333662087 has 4 divisors (see below), whose sum is σ = 81334281600. Its totient is φ = 81333042576.

The previous prime is 81333662057. The next prime is 81333662093. The reversal of 81333662087 is 78026633318.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81333662087 - 2⁸ = 81333661831 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 (81333662057) 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, 26462 + ... + 404187.

It is an arithmetic number, because the mean of its divisors is an integer number (20333570400).

Almost surely, 2^81333662087 is an apocalyptic number.

81333662087 is a deficient number, since it is larger than the sum of its proper divisors (619513).

81333662087 is a wasteful number, since it uses less digits than its factorization.

81333662087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619512.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 81333662087 in words is "eighty-one billion, three hundred thirty-three million, six hundred sixty-two thousand, eighty-seven".