18921447314641 has 27 divisors (see below), whose sum is σ = 20097626457321. Its totient is φ = 17811501739848.

The previous prime is 18921447314629. The next prime is 18921447314719. The reversal of 18921447314641 is 14641374412981.

The square root of 18921447314641 is 4349879.

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

It is not a de Polignac number, because 18921447314641 - 2⁷ = 18921447314513 is a prime.

It is a super-2 number, since 2×18921447314641² (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 (18921447314141) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 14793937840 + ... + 14793939118.

Almost surely, 2^{18921447314641} is an apocalyptic number.

18921447314641 is the 4349879-th square number.

18921447314641 is the 2174940-th centered octagonal number.

It is an amenable number.

18921447314641 is a deficient number, since it is larger than the sum of its proper divisors (1176179142680).

18921447314641 is an frugal number, since it uses more digits than its factorization.

18921447314641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954 (or 1477 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The spelling of 18921447314641 in words is "eighteen trillion, nine hundred twenty-one billion, four hundred forty-seven million, three hundred fourteen thousand, six hundred forty-one".