81542862312 has 16 divisors (see below), whose sum is σ = 203857155840. Its totient is φ = 27180954096.

The previous prime is 81542862311. The next prime is 81542862353. The reversal of 81542862312 is 21326824518.

It is not an unprimeable number, because it can be changed into a prime (81542862311) 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, 1698809608 + ... + 1698809655.

It is an arithmetic number, because the mean of its divisors is an integer number (12741072240).

Almost surely, 2^81542862312 is an apocalyptic number.

It is an amenable number.

81542862312 is an abundant number, since it is smaller than the sum of its proper divisors (122314293528).

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

81542862312 is a wasteful number, since it uses less digits than its factorization.

81542862312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397619272 (or 3397619268 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The spelling of 81542862312 in words is "eighty-one billion, five hundred forty-two million, eight hundred sixty-two thousand, three hundred twelve".