247678117917 has 8 divisors (see below), whose sum is σ = 340890312960. Its totient is φ = 159792334080.

The previous prime is 247678117891. The next prime is 247678117957. The reversal of 247678117917 is 719711876742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-247678117917 is a prime.

It is a super-2 number, since 2×247678117917² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247678117957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1331602692 + ... + 1331602877.

It is an arithmetic number, because the mean of its divisors is an integer number (42611289120).

Almost surely, 2^247678117917 is an apocalyptic number.

It is an amenable number.

247678117917 is a deficient number, since it is larger than the sum of its proper divisors (93212195043).

247678117917 is a wasteful number, since it uses less digits than its factorization.

247678117917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663205603.

The product of its digits is 8297856, while the sum is 60.

The spelling of 247678117917 in words is "two hundred forty-seven billion, six hundred seventy-eight million, one hundred seventeen thousand, nine hundred seventeen".