18354344345381 has 4 divisors (see below), whose sum is σ = 20022921104064. Its totient is φ = 16685767586700.

The previous prime is 18354344345377. The next prime is 18354344345383.

It is a happy number.

18354344345381 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18354344345381 - 2² = 18354344345377 is a prime.

It is a super-2 number, since 2×18354344345381² (a number of 27 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 (18354344345383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834288379325 + ... + 834288379346.

It is an arithmetic number, because the mean of its divisors is an integer number (5005730276016).

Almost surely, 2^{18354344345381} is an apocalyptic number.

18354344345381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18354344345381 is a deficient number, since it is larger than the sum of its proper divisors (1668576758683).

18354344345381 is a wasteful number, since it uses less digits than its factorization.

18354344345381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668576758682.

The product of its digits is 33177600, while the sum is 56.

The spelling of 18354344345381 in words is "eighteen trillion, three hundred fifty-four billion, three hundred forty-four million, three hundred forty-five thousand, three hundred eighty-one".