999647787247 has 2 divisors, whose sum is σ = 999647787248. Its totient is φ = 999647787246.

The previous prime is 999647787199. The next prime is 999647787263. The reversal of 999647787247 is 742787746999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999647787247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999647788247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499823893623 + 499823893624.

It is an arithmetic number, because the mean of its divisors is an integer number (499823893624).

Almost surely, 2^999647787247 is an apocalyptic number.

999647787247 is a deficient number, since it is larger than the sum of its proper divisors (1).

999647787247 is an equidigital number, since it uses as much as digits as its factorization.

999647787247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688505344, while the sum is 79.

The spelling of 999647787247 in words is "nine hundred ninety-nine billion, six hundred forty-seven million, seven hundred eighty-seven thousand, two hundred forty-seven".