18442308779437 has 4 divisors (see below), whose sum is σ = 18442408611196. Its totient is φ = 18442208947680.

The previous prime is 18442308779417. The next prime is 18442308779467. The reversal of 18442308779437 is 73497780324481.

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 8393877933961 + 10048430845476 = 2897219^2 + 3169926^2 .

It is a cyclic number.

It is not a de Polignac number, because 18442308779437 - 2⁷ = 18442308779309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18442308779417) 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, 49638264 + ... + 50008417.

It is an arithmetic number, because the mean of its divisors is an integer number (4610602152799).

Almost surely, 2^{18442308779437} is an apocalyptic number.

It is an amenable number.

18442308779437 is a deficient number, since it is larger than the sum of its proper divisors (99831759).

18442308779437 is an equidigital number, since it uses as much as digits as its factorization.

18442308779437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99831758.

The product of its (nonzero) digits is 227598336, while the sum is 67.

The spelling of 18442308779437 in words is "eighteen trillion, four hundred forty-two billion, three hundred eight million, seven hundred seventy-nine thousand, four hundred thirty-seven".