18677168680681 has 9 divisors (see below), whose sum is σ = 21726537533949. Its totient is φ = 16008975796044.

The previous prime is 18677168680633. The next prime is 18677168680787. The reversal of 18677168680681 is 18608686177681.

The square root of 18677168680681 is 4321709.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 18677168680681 - 2¹¹ = 18677168678633 is a prime.

It is a super-2 number, since 2×18677168680681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18677168680981) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29943270 + ... + 30560656.

Almost surely, 2^{18677168680681} is an apocalyptic number.

18677168680681 is the 4321709-th square number.

18677168680681 is the 2160855-th centered octagonal number.

It is an amenable number.

18677168680681 is a deficient number, since it is larger than the sum of its proper divisors (3049368853268).

18677168680681 is an frugal number, since it uses more digits than its factorization.

18677168680681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234788 (or 617394 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 73.

The spelling of 18677168680681 in words is "eighteen trillion, six hundred seventy-seven billion, one hundred sixty-eight million, six hundred eighty thousand, six hundred eighty-one".