81566190606235 has 8 divisors (see below), whose sum is σ = 97884468719856. Its totient is φ = 65249592490080.

The previous prime is 81566190606233. The next prime is 81566190606301. The reversal of 81566190606235 is 53260609166518.

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

It is not a de Polignac number, because 81566190606235 - 2¹ = 81566190606233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81566190606235.

It is not an unprimeable number, because it can be changed into a prime (81566190606233) 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, 419892549 + ... + 420086758.

It is an arithmetic number, because the mean of its divisors is an integer number (12235558589982).

Almost surely, 2^{81566190606235} is an apocalyptic number.

81566190606235 is a deficient number, since it is larger than the sum of its proper divisors (16318278113621).

81566190606235 is a wasteful number, since it uses less digits than its factorization.

81566190606235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839998733.

The product of its (nonzero) digits is 13996800, while the sum is 58.

The spelling of 81566190606235 in words is "eighty-one trillion, five hundred sixty-six billion, one hundred ninety million, six hundred six thousand, two hundred thirty-five".