18525603923 has 4 divisors (see below), whose sum is σ = 18526797600. Its totient is φ = 18524410248.

The previous prime is 18525603907. The next prime is 18525603931. The reversal of 18525603923 is 32930652581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32930652581 = 197 ⋅167160673.

It is a cyclic number.

It is not a de Polignac number, because 18525603923 - 2⁴ = 18525603907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18525603973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573248 + ... + 604701.

It is an arithmetic number, because the mean of its divisors is an integer number (4631699400).

Almost surely, 2^18525603923 is an apocalyptic number.

18525603923 is a deficient number, since it is larger than the sum of its proper divisors (1193677).

18525603923 is a wasteful number, since it uses less digits than its factorization.

18525603923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193676.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 18525603923 in words is "eighteen billion, five hundred twenty-five million, six hundred three thousand, nine hundred twenty-three".