18457667881 has 3 divisors (see below), whose sum is σ = 18457803741. Its totient is φ = 18457532022.

The previous prime is 18457667867. The next prime is 18457667909. The reversal of 18457667881 is 18876675481.

The square root of 18457667881 is 135859.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18457667881 - 2⁵ = 18457667849 is a prime.

It is a super-2 number, since 2×18457667881² (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 (18457667801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67930 + ... + 203788.

It is an arithmetic number, because the mean of its divisors is an integer number (6152601247).

Almost surely, 2^18457667881 is an apocalyptic number.

18457667881 is the 135859-th square number.

18457667881 is the 67930-th centered octagonal number.

It is an amenable number.

18457667881 is a deficient number, since it is larger than the sum of its proper divisors (135860).

18457667881 is an frugal number, since it uses more digits than its factorization.

18457667881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271718 (or 135859 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 61.

The spelling of 18457667881 in words is "eighteen billion, four hundred fifty-seven million, six hundred sixty-seven thousand, eight hundred eighty-one".