18548130997 has 4 divisors (see below), whose sum is σ = 20234324736. Its totient is φ = 16861937260.

The previous prime is 18548130989. The next prime is 18548131003. The reversal of 18548130997 is 79903184581.

It is a happy number.

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 18548130997 - 2³ = 18548130989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18548133997) 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, 843096853 + ... + 843096874.

It is an arithmetic number, because the mean of its divisors is an integer number (5058581184).

Almost surely, 2^18548130997 is an apocalyptic number.

It is an amenable number.

18548130997 is a deficient number, since it is larger than the sum of its proper divisors (1686193739).

18548130997 is a wasteful number, since it uses less digits than its factorization.

18548130997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686193738.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 18548130997 in words is "eighteen billion, five hundred forty-eight million, one hundred thirty thousand, nine hundred ninety-seven".