18064442158949 has 4 divisors (see below), whose sum is σ = 18155218250400. Its totient is φ = 17973666067500.

The previous prime is 18064442158937. The next prime is 18064442159053. The reversal of 18064442158949 is 94985124446081.

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 a de Polignac number, because none of the positive numbers 2^k-18064442158949 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 (18064442158249) 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, 45388045427 + ... + 45388045824.

It is an arithmetic number, because the mean of its divisors is an integer number (4538804562600).

Almost surely, 2^{18064442158949} is an apocalyptic number.

It is an amenable number.

18064442158949 is a deficient number, since it is larger than the sum of its proper divisors (90776091451).

18064442158949 is an equidigital number, since it uses as much as digits as its factorization.

18064442158949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90776091450.

The product of its (nonzero) digits is 79626240, while the sum is 65.

The spelling of 18064442158949 in words is "eighteen trillion, sixty-four billion, four hundred forty-two million, one hundred fifty-eight thousand, nine hundred forty-nine".