81492651366 has 96 divisors (see below), whose sum is σ = 199693307520. Its totient is φ = 22044960000.

The previous prime is 81492651323. The next prime is 81492651379. The reversal of 81492651366 is 66315629418.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12570846 + ... + 12577326.

It is an arithmetic number, because the mean of its divisors is an integer number (2080138620).

Almost surely, 2^81492651366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81492651366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99846653760).

81492651366 is an abundant number, since it is smaller than the sum of its proper divisors (118200656154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81492651366 is a wasteful number, since it uses less digits than its factorization.

81492651366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8770 (or 8763 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The spelling of 81492651366 in words is "eighty-one billion, four hundred ninety-two million, six hundred fifty-one thousand, three hundred sixty-six".