81247143460 has 48 divisors (see below), whose sum is σ = 195214271616. Its totient is φ = 27824573952.

The previous prime is 81247143451. The next prime is 81247143499. The reversal of 81247143460 is 6434174218.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204997 + ... + 452236.

It is an arithmetic number, because the mean of its divisors is an integer number (4066963992).

Almost surely, 2^81247143460 is an apocalyptic number.

It is an amenable number.

81247143460 is an abundant number, since it is smaller than the sum of its proper divisors (113967128156).

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

81247143460 is a wasteful number, since it uses less digits than its factorization.

81247143460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658132 (or 658130 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 81247143460 in words is "eighty-one billion, two hundred forty-seven million, one hundred forty-three thousand, four hundred sixty".