3668637803861 has 2 divisors, whose sum is σ = 3668637803862. Its totient is φ = 3668637803860.

The previous prime is 3668637803837. The next prime is 3668637803863. The reversal of 3668637803861 is 1683087368663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2544838515025 + 1123799288836 = 1595255^2 + 1060094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3668637803861 is a prime.

It is a super-2 number, since 2×3668637803861² (a number of 26 digits) contains 22 as substring.

Together with 3668637803863, 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 (3668637803863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1834318901930 + 1834318901931.

It is an arithmetic number, because the mean of its divisors is an integer number (1834318901931).

Almost surely, 2^{3668637803861} is an apocalyptic number.

It is an amenable number.

3668637803861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3668637803861 is an equidigital number, since it uses as much as digits as its factorization.

3668637803861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125411328, while the sum is 65.

The spelling of 3668637803861 in words is "three trillion, six hundred sixty-eight billion, six hundred thirty-seven million, eight hundred three thousand, eight hundred sixty-one".