671766517 has 2 divisors, whose sum is σ = 671766518. Its totient is φ = 671766516.

The previous prime is 671766503. The next prime is 671766523. The reversal of 671766517 is 715667176.

671766517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 656076996 + 15689521 = 25614^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 671766517 - 2¹⁵ = 671733749 is a prime.

It is a super-2 number, since 2×671766517² = 902540506724622578, which contains 22 as substring.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671766317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335883258 + 335883259.

It is an arithmetic number, because the mean of its divisors is an integer number (335883259).

Almost surely, 2^671766517 is an apocalyptic number.

It is an amenable number.

671766517 is a deficient number, since it is larger than the sum of its proper divisors (1).

671766517 is an equidigital number, since it uses as much as digits as its factorization.

671766517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 46.

The square root of 671766517 is about 25918.4590012601. The cubic root of 671766517 is about 875.8023734423.

The spelling of 671766517 in words is "six hundred seventy-one million, seven hundred sixty-six thousand, five hundred seventeen".