647117663 has 2 divisors, whose sum is σ = 647117664. Its totient is φ = 647117662.

The previous prime is 647117641. The next prime is 647117683. The reversal of 647117663 is 366711746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647117663 - 2¹⁶ = 647052127 is a prime.

It is a super-2 number, since 2×647117663² = 837522539533163138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647117663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647117683) 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 as a sum of consecutive naturals, namely, 323558831 + 323558832.

It is an arithmetic number, because the mean of its divisors is an integer number (323558832).

Almost surely, 2^647117663 is an apocalyptic number.

647117663 is a deficient number, since it is larger than the sum of its proper divisors (1).

647117663 is an equidigital number, since it uses as much as digits as its factorization.

647117663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 647117663 is about 25438.5074837342. The cubic root of 647117663 is about 864.9568013888.

The spelling of 647117663 in words is "six hundred forty-seven million, one hundred seventeen thousand, six hundred sixty-three".