81932137366 has 8 divisors (see below), whose sum is σ = 128241606384. Its totient is φ = 39184935240.

The previous prime is 81932137361. The next prime is 81932137379. The reversal of 81932137366 is 66373123918.

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

It is a super-2 number, since 2×81932137366² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81932137361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890566665 + ... + 890566756.

It is an arithmetic number, because the mean of its divisors is an integer number (16030200798).

Almost surely, 2^81932137366 is an apocalyptic number.

81932137366 is a deficient number, since it is larger than the sum of its proper divisors (46309469018).

81932137366 is a wasteful number, since it uses less digits than its factorization.

81932137366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781133446.

The product of its digits is 979776, while the sum is 49.

The spelling of 81932137366 in words is "eighty-one billion, nine hundred thirty-two million, one hundred thirty-seven thousand, three hundred sixty-six".