18461631943 has 4 divisors (see below), whose sum is σ = 18467279248. Its totient is φ = 18455984640.

The previous prime is 18461631917. The next prime is 18461631949. The reversal of 18461631943 is 34913616481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18461631943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18461631893 and 18461631902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18461631949) 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, 2818746 + ... + 2825287.

It is an arithmetic number, because the mean of its divisors is an integer number (4616819812).

Almost surely, 2^18461631943 is an apocalyptic number.

18461631943 is a deficient number, since it is larger than the sum of its proper divisors (5647305).

18461631943 is an equidigital number, since it uses as much as digits as its factorization.

18461631943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647304.

The product of its digits is 373248, while the sum is 46.

The spelling of 18461631943 in words is "eighteen billion, four hundred sixty-one million, six hundred thirty-one thousand, nine hundred forty-three".