1868668517 has 2 divisors, whose sum is σ = 1868668518. Its totient is φ = 1868668516.

The previous prime is 1868668507. The next prime is 1868668523. The reversal of 1868668517 is 7158668681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068570721 + 800097796 = 32689^2 + 28286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868668517 - 2⁶ = 1868668453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868668507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934334258 + 934334259.

It is an arithmetic number, because the mean of its divisors is an integer number (934334259).

Almost surely, 2^1868668517 is an apocalyptic number.

It is an amenable number.

1868668517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868668517 is an equidigital number, since it uses as much as digits as its factorization.

1868668517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 56.

The square root of 1868668517 is about 43228.0986974907. The cubic root of 1868668517 is about 1231.7164914925.

The spelling of 1868668517 in words is "one billion, eight hundred sixty-eight million, six hundred sixty-eight thousand, five hundred seventeen".