187863999947 has 4 divisors (see below), whose sum is σ = 202315076880. Its totient is φ = 173412923016.

The previous prime is 187863999943. The next prime is 187863999949. The reversal of 187863999947 is 749999368781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 187863999947 - 2² = 187863999943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187863999943) 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, 7225538447 + ... + 7225538472.

It is an arithmetic number, because the mean of its divisors is an integer number (50578769220).

Almost surely, 2^187863999947 is an apocalyptic number.

187863999947 is a deficient number, since it is larger than the sum of its proper divisors (14451076933).

187863999947 is a wasteful number, since it uses less digits than its factorization.

187863999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14451076932.

The product of its digits is 1481421312, while the sum is 80.

The spelling of 187863999947 in words is "one hundred eighty-seven billion, eight hundred sixty-three million, nine hundred ninety-nine thousand, nine hundred forty-seven".