18541513969 has 4 divisors (see below), whose sum is σ = 20227106160. Its totient is φ = 16855921780.

The previous prime is 18541513961. The next prime is 18541513973. The reversal of 18541513969 is 96931514581.

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 not a de Polignac number, because 18541513969 - 2³ = 18541513961 is a prime.

It is a super-2 number, since 2×18541513969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18541513961) 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, 842796079 + ... + 842796100.

It is an arithmetic number, because the mean of its divisors is an integer number (5056776540).

Almost surely, 2^18541513969 is an apocalyptic number.

It is an amenable number.

18541513969 is a deficient number, since it is larger than the sum of its proper divisors (1685592191).

18541513969 is a wasteful number, since it uses less digits than its factorization.

18541513969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685592190.

The product of its digits is 1166400, while the sum is 52.

The spelling of 18541513969 in words is "eighteen billion, five hundred forty-one million, five hundred thirteen thousand, nine hundred sixty-nine".