18957947289 has 4 divisors (see below), whose sum is σ = 25277263056. Its totient is φ = 12638631524.

The previous prime is 18957947269. The next prime is 18957947293. The reversal of 18957947289 is 98274975981.

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 18957947289 - 2⁵ = 18957947257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18957947269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159657879 + ... + 3159657884.

It is an arithmetic number, because the mean of its divisors is an integer number (6319315764).

Almost surely, 2^18957947289 is an apocalyptic number.

It is an amenable number.

18957947289 is a deficient number, since it is larger than the sum of its proper divisors (6319315767).

18957947289 is an equidigital number, since it uses as much as digits as its factorization.

18957947289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6319315766.

The product of its digits is 91445760, while the sum is 69.

The spelling of 18957947289 in words is "eighteen billion, nine hundred fifty-seven million, nine hundred forty-seven thousand, two hundred eighty-nine".