81241211456 has 28 divisors (see below), whose sum is σ = 161259652080. Its totient is φ = 40608858240.

The previous prime is 81241211453. The next prime is 81241211473. The reversal of 81241211456 is 65411214218.

It is not an unprimeable number, because it can be changed into a prime (81241211453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41615 + ... + 405233.

Almost surely, 2^81241211456 is an apocalyptic number.

It is an amenable number.

81241211456 is a deficient number, since it is larger than the sum of its proper divisors (80018440624).

81241211456 is a wasteful number, since it uses less digits than its factorization.

81241211456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367122 (or 367112 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The spelling of 81241211456 in words is "eighty-one billion, two hundred forty-one million, two hundred eleven thousand, four hundred fifty-six".