18457817381 has 8 divisors (see below), whose sum is σ = 19013834400. Its totient is φ = 17907562512.

The previous prime is 18457817363. The next prime is 18457817383. The reversal of 18457817381 is 18371875481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18457817381 - 2²² = 18453623077 is a prime.

It is a super-2 number, since 2×18457817381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18457817383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1434035 + ... + 1446848.

It is an arithmetic number, because the mean of its divisors is an integer number (2376729300).

Almost surely, 2^18457817381 is an apocalyptic number.

It is an amenable number.

18457817381 is a deficient number, since it is larger than the sum of its proper divisors (556017019).

18457817381 is a wasteful number, since it uses less digits than its factorization.

18457817381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881075.

The product of its digits is 1505280, while the sum is 53.

The spelling of 18457817381 in words is "eighteen billion, four hundred fifty-seven million, eight hundred seventeen thousand, three hundred eighty-one".