81241267480 has 64 divisors (see below), whose sum is σ = 184775048640. Its totient is φ = 32144474112.

The previous prime is 81241267469. The next prime is 81241267487. The reversal of 81241267480 is 8476214218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81241267487) 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, 9373629 + ... + 9382291.

It is an arithmetic number, because the mean of its divisors is an integer number (2887110135).

Almost surely, 2^81241267480 is an apocalyptic number.

It is an amenable number.

81241267480 is an abundant number, since it is smaller than the sum of its proper divisors (103533781160).

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

81241267480 is a wasteful number, since it uses less digits than its factorization.

81241267480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11188 (or 11184 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 81241267480 in words is "eighty-one billion, two hundred forty-one million, two hundred sixty-seven thousand, four hundred eighty".