18486981523201 has 9 divisors (see below), whose sum is σ = 18712761020449. Its totient is φ = 18263894234836.

The previous prime is 18486981523159. The next prime is 18486981523271. The reversal of 18486981523201 is 10232518968481.

The square root of 18486981523201 is 4299649.

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

It is not a de Polignac number, because 18486981523201 - 2⁹ = 18486981522689 is a prime.

It is a super-2 number, since 2×18486981523201² (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 (18486981523271) 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, 356844966 + ... + 356896768.

Almost surely, 2^{18486981523201} is an apocalyptic number.

18486981523201 is the 4299649-th square number.

18486981523201 is the 2149825-th centered octagonal number.

It is an amenable number.

18486981523201 is a deficient number, since it is larger than the sum of its proper divisors (225779497248).

18486981523201 is an frugal number, since it uses more digits than its factorization.

18486981523201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103772 (or 51886 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 58.

The spelling of 18486981523201 in words is "eighteen trillion, four hundred eighty-six billion, nine hundred eighty-one million, five hundred twenty-three thousand, two hundred one".