18537425963 has 4 divisors (see below), whose sum is σ = 21185629680. Its totient is φ = 15889222248.

The previous prime is 18537425953. The next prime is 18537425987. The reversal of 18537425963 is 36952473581.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18537425963 is a prime.

It is a super-2 number, since 2×18537425963² (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 (18537425953) 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, 1324101848 + ... + 1324101861.

It is an arithmetic number, because the mean of its divisors is an integer number (5296407420).

Almost surely, 2^18537425963 is an apocalyptic number.

18537425963 is a deficient number, since it is larger than the sum of its proper divisors (2648203717).

18537425963 is an equidigital number, since it uses as much as digits as its factorization.

18537425963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648203716.

The product of its digits is 5443200, while the sum is 53.

The spelling of 18537425963 in words is "eighteen billion, five hundred thirty-seven million, four hundred twenty-five thousand, nine hundred sixty-three".