18361045443 has 32 divisors (see below), whose sum is σ = 26553010176. Its totient is φ = 11218647168.

The previous prime is 18361045421. The next prime is 18361045481. The reversal of 18361045443 is 34454016381.

It is a happy number.

It is not a de Polignac number, because 18361045443 - 2⁵ = 18361045411 is a prime.

It is a super-2 number, since 2×18361045443² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18361041443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3248646 + ... + 3254292.

It is an arithmetic number, because the mean of its divisors is an integer number (829781568).

Almost surely, 2^18361045443 is an apocalyptic number.

18361045443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18361045443 is a deficient number, since it is larger than the sum of its proper divisors (8191964733).

18361045443 is a wasteful number, since it uses less digits than its factorization.

18361045443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 18361045443 in words is "eighteen billion, three hundred sixty-one million, forty-five thousand, four hundred forty-three".