81535165786 has 8 divisors (see below), whose sum is σ = 122672244384. Its totient is φ = 40644417660.

The previous prime is 81535165781. The next prime is 81535165813. The reversal of 81535165786 is 68756153518.

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

It is not an unprimeable number, because it can be changed into a prime (81535165781) 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, 61581790 + ... + 61583113.

It is an arithmetic number, because the mean of its divisors is an integer number (15334030548).

Almost surely, 2^81535165786 is an apocalyptic number.

81535165786 is a deficient number, since it is larger than the sum of its proper divisors (41137078598).

81535165786 is a wasteful number, since it uses less digits than its factorization.

81535165786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123165236.

The product of its digits is 6048000, while the sum is 55.

The spelling of 81535165786 in words is "eighty-one billion, five hundred thirty-five million, one hundred sixty-five thousand, seven hundred eighty-six".