3667810819961 has 2 divisors, whose sum is σ = 3667810819962. Its totient is φ = 3667810819960.

The previous prime is 3667810819919. The next prime is 3667810819997. The reversal of 3667810819961 is 1699180187663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2615801614336 + 1052009205625 = 1617344^2 + 1025675^2 .

It is a cyclic number.

It is not a de Polignac number, because 3667810819961 - 2¹⁰ = 3667810818937 is a prime.

It is a super-2 number, since 2×3667810819961² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3667810819061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833905409980 + 1833905409981.

It is an arithmetic number, because the mean of its divisors is an integer number (1833905409981).

Almost surely, 2^{3667810819961} is an apocalyptic number.

It is an amenable number.

3667810819961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3667810819961 is an equidigital number, since it uses as much as digits as its factorization.

3667810819961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 65.

The spelling of 3667810819961 in words is "three trillion, six hundred sixty-seven billion, eight hundred ten million, eight hundred nineteen thousand, nine hundred sixty-one".