18657788775681 has 16 divisors (see below), whose sum is σ = 27138904040448. Its totient is φ = 11307624862800.

The previous prime is 18657788775677. The next prime is 18657788775739.

18657788775681 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18657788775681 - 2² = 18657788775677 is a prime.

It is a super-2 number, since 2×18657788775681² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18657788775594 and 18657788775603.

It is not an unprimeable number, because it can be changed into a prime (18657788775641) 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, 95005 + ... + 6109386.

It is an arithmetic number, because the mean of its divisors is an integer number (1696181502528).

Almost surely, 2^{18657788775681} is an apocalyptic number.

18657788775681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18657788775681 is a deficient number, since it is larger than the sum of its proper divisors (8481115264767).

18657788775681 is a wasteful number, since it uses less digits than its factorization.

18657788775681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295532.

The product of its digits is 8851046400, while the sum is 84.

The spelling of 18657788775681 in words is "eighteen trillion, six hundred fifty-seven billion, seven hundred eighty-eight million, seven hundred seventy-five thousand, six hundred eighty-one".