18948563565 has 32 divisors (see below), whose sum is σ = 30810501120. Its totient is φ = 9942543936.

The previous prime is 18948563521. The next prime is 18948563573. The reversal of 18948563565 is 56536584981.

It is not a de Polignac number, because 18948563565 - 2⁷ = 18948563437 is a prime.

It is a super-2 number, since 2×18948563565² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18948563499 and 18948563508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307104 + ... + 363606.

It is an arithmetic number, because the mean of its divisors is an integer number (962828160).

Almost surely, 2^18948563565 is an apocalyptic number.

18948563565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18948563565 is a deficient number, since it is larger than the sum of its proper divisors (11861937555).

18948563565 is a wasteful number, since it uses less digits than its factorization.

18948563565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56873.

The product of its digits is 31104000, while the sum is 60.

The spelling of 18948563565 in words is "eighteen billion, nine hundred forty-eight million, five hundred sixty-three thousand, five hundred sixty-five".