81486166272 has 144 divisors (see below), whose sum is σ = 248272023552. Its totient is φ = 23242475520.

The previous prime is 81486166271. The next prime is 81486166277. The reversal of 81486166272 is 27266168418.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81486166271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3250747 + ... + 3275717.

Almost surely, 2^81486166272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81486166272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124136011776).

81486166272 is an abundant number, since it is smaller than the sum of its proper divisors (166785857280).

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

81486166272 is a wasteful number, since it uses less digits than its factorization.

81486166272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25604 (or 25590 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 51.

The spelling of 81486166272 in words is "eighty-one billion, four hundred eighty-six million, one hundred sixty-six thousand, two hundred seventy-two".