81542248152 has 64 divisors (see below), whose sum is σ = 207754541280.
Its totient is φ = 26661153792.
The previous prime is 81542248097. The next prime is 81542248153. The reversal of 81542248152 is 25184224518.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (81542248153) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8635978 + ... + 8645414.
Almost surely, 281542248152 is an apocalyptic number.
It is an amenable number.
81542248152 is an abundant number, since it is smaller than the sum of its proper divisors (126212293128).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81542248152 is a wasteful number, since it uses less digits than its factorization.
81542248152 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 16292 (or 16288 counting only the distinct ones).
The product of its digits is 204800, while the sum is 42.
The spelling of 81542248152 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred fifty-two".