18870312247 has 2 divisors, whose sum is σ = 18870312248. Its totient is φ = 18870312246.

The previous prime is 18870312221. The next prime is 18870312299. The reversal of 18870312247 is 74221307881.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18870312247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18870312547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9435156123 + 9435156124.

It is an arithmetic number, because the mean of its divisors is an integer number (9435156124).

Almost surely, 2^18870312247 is an apocalyptic number.

18870312247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18870312247 is an equidigital number, since it uses as much as digits as its factorization.

18870312247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 18870312247 in words is "eighteen billion, eight hundred seventy million, three hundred twelve thousand, two hundred forty-seven".