18860354400947 has 2 divisors, whose sum is σ = 18860354400948. Its totient is φ = 18860354400946.

The previous prime is 18860354400917. The next prime is 18860354400949. The reversal of 18860354400947 is 74900445306881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18860354400947 is a prime.

Together with 18860354400949, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18860354400949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430177200473 + 9430177200474.

It is an arithmetic number, because the mean of its divisors is an integer number (9430177200474).

Almost surely, 2^{18860354400947} is an apocalyptic number.

18860354400947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18860354400947 is an equidigital number, since it uses as much as digits as its factorization.

18860354400947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 59.

The spelling of 18860354400947 in words is "eighteen trillion, eight hundred sixty billion, three hundred fifty-four million, four hundred thousand, nine hundred forty-seven".