81281242416 has 80 divisors (see below), whose sum is σ = 229102265088. Its totient is φ = 24626707200.

The previous prime is 81281242411. The next prime is 81281242423. The reversal of 81281242416 is 61424218218.

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 (81281242411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6333286 + ... + 6346106.

Almost surely, 2^81281242416 is an apocalyptic number.

It is an amenable number.

81281242416 is an abundant number, since it is smaller than the sum of its proper divisors (147821022672).

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

81281242416 is a wasteful number, since it uses less digits than its factorization.

81281242416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24850 (or 24844 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The spelling of 81281242416 in words is "eighty-one billion, two hundred eighty-one million, two hundred forty-two thousand, four hundred sixteen".