18260128678561 has 32 divisors (see below), whose sum is σ = 22894813209600. Its totient is φ = 14148097346880.

The previous prime is 18260128678559. The next prime is 18260128678607. The reversal of 18260128678561 is 16587682106281.

It is not a de Polignac number, because 18260128678561 - 2¹ = 18260128678559 is a prime.

It is a super-2 number, since 2×18260128678561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18260128678561.

It is not an unprimeable number, because it can be changed into a prime (18260128678541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211842970 + ... + 211929148.

It is an arithmetic number, because the mean of its divisors is an integer number (715462912800).

Almost surely, 2^{18260128678561} is an apocalyptic number.

18260128678561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18260128678561 is a deficient number, since it is larger than the sum of its proper divisors (4634684531039).

18260128678561 is a wasteful number, since it uses less digits than its factorization.

18260128678561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101749.

The product of its (nonzero) digits is 15482880, while the sum is 61.

It can be divided in two parts, 18260 and 128678561, that added together give a palindrome (128696821).

The spelling of 18260128678561 in words is "eighteen trillion, two hundred sixty billion, one hundred twenty-eight million, six hundred seventy-eight thousand, five hundred sixty-one".