82281206512561 has 16 divisors (see below), whose sum is σ = 94252146912000. Its totient is φ = 70364410195968.

The previous prime is 82281206512553. The next prime is 82281206512733. The reversal of 82281206512561 is 16521560218228.

It is not a de Polignac number, because 82281206512561 - 2³ = 82281206512553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82281206512511) 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, 41341945 + ... + 43286473.

It is an arithmetic number, because the mean of its divisors is an integer number (5890759182000).

Almost surely, 2^{82281206512561} is an apocalyptic number.

It is an amenable number.

82281206512561 is a deficient number, since it is larger than the sum of its proper divisors (11970940399439).

82281206512561 is a wasteful number, since it uses less digits than its factorization.

82281206512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958448.

The product of its (nonzero) digits is 921600, while the sum is 49.

The spelling of 82281206512561 in words is "eighty-two trillion, two hundred eighty-one billion, two hundred six million, five hundred twelve thousand, five hundred sixty-one".