18414437641 has 4 divisors (see below), whose sum is σ = 18415910212. Its totient is φ = 18412965072.

The previous prime is 18414437623. The next prime is 18414437681. The reversal of 18414437641 is 14673441481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12125313225 + 6289124416 = 110115^2 + 79304^2 .

It is a cyclic number.

It is not a de Polignac number, because 18414437641 - 2⁷ = 18414437513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18414437681) 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, 717366 + ... + 742591.

It is an arithmetic number, because the mean of its divisors is an integer number (4603977553).

Almost surely, 2^18414437641 is an apocalyptic number.

It is an amenable number.

18414437641 is a deficient number, since it is larger than the sum of its proper divisors (1472571).

18414437641 is a wasteful number, since it uses less digits than its factorization.

18414437641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472570.

The product of its digits is 258048, while the sum is 43.

The spelling of 18414437641 in words is "eighteen billion, four hundred fourteen million, four hundred thirty-seven thousand, six hundred forty-one".