18948411617 has 4 divisors (see below), whose sum is σ = 19053099156. Its totient is φ = 18843724080.

The previous prime is 18948411593. The next prime is 18948411619. The reversal of 18948411617 is 71611484981.

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 9838854481 + 9109557136 = 99191^2 + 95444^2 .

It is a cyclic number.

It is not a de Polignac number, because 18948411617 - 2²⁶ = 18881302753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18948411619) 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, 52343498 + ... + 52343859.

It is an arithmetic number, because the mean of its divisors is an integer number (4763274789).

Almost surely, 2^18948411617 is an apocalyptic number.

It is an amenable number.

18948411617 is a deficient number, since it is larger than the sum of its proper divisors (104687539).

18948411617 is a wasteful number, since it uses less digits than its factorization.

18948411617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104687538.

The product of its digits is 387072, while the sum is 50.

The spelling of 18948411617 in words is "eighteen billion, nine hundred forty-eight million, four hundred eleven thousand, six hundred seventeen".