18824642881 has 6 divisors (see below), whose sum is σ = 20691549746. Its totient is φ = 17113311600.

The previous prime is 18824642831. The next prime is 18824642891.

18824642881 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 11575823281 + 7248819600 = 107591^2 + 85140^2 .

It is not a de Polignac number, because 18824642881 - 2¹⁵ = 18824610113 is a prime.

It is a super-2 number, since 2×18824642881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18824642831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77787660 + ... + 77787901.

Almost surely, 2^18824642881 is an apocalyptic number.

18824642881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18824642881 is a deficient number, since it is larger than the sum of its proper divisors (1866906865).

18824642881 is a wasteful number, since it uses less digits than its factorization.

18824642881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155575583 (or 155575572 counting only the distinct ones).

The product of its digits is 1572864, while the sum is 52.

The spelling of 18824642881 in words is "eighteen billion, eight hundred twenty-four million, six hundred forty-two thousand, eight hundred eighty-one".