646118117 has 2 divisors, whose sum is σ = 646118118. Its totient is φ = 646118116.

The previous prime is 646118113. The next prime is 646118119. The reversal of 646118117 is 711811646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643180321 + 2937796 = 25361^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 646118117 - 2² = 646118113 is a prime.

It is a super-2 number, since 2×646118117² = 834937242231251378, which contains 22 as substring.

Together with 646118119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646118111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323059058 + 323059059.

It is an arithmetic number, because the mean of its divisors is an integer number (323059059).

Almost surely, 2^646118117 is an apocalyptic number.

It is an amenable number.

646118117 is a deficient number, since it is larger than the sum of its proper divisors (1).

646118117 is an equidigital number, since it uses as much as digits as its factorization.

646118117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 646118117 is about 25418.8535736764. The cubic root of 646118117 is about 864.5112308836.

The spelling of 646118117 in words is "six hundred forty-six million, one hundred eighteen thousand, one hundred seventeen".