18281412561 has 16 divisors (see below), whose sum is σ = 24623668224. Its totient is φ = 12063574224.

The previous prime is 18281412559. The next prime is 18281412581. The reversal of 18281412561 is 16521418281.

It is not a de Polignac number, because 18281412561 - 2¹ = 18281412559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18281412511) 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, 369300 + ... + 415866.

It is an arithmetic number, because the mean of its divisors is an integer number (1538979264).

Almost surely, 2^18281412561 is an apocalyptic number.

It is an amenable number.

18281412561 is a deficient number, since it is larger than the sum of its proper divisors (6342255663).

18281412561 is a wasteful number, since it uses less digits than its factorization.

18281412561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47900.

The product of its digits is 30720, while the sum is 39.

The spelling of 18281412561 in words is "eighteen billion, two hundred eighty-one million, four hundred twelve thousand, five hundred sixty-one".