1804660107661 has 2 divisors, whose sum is σ = 1804660107662. Its totient is φ = 1804660107660.

The previous prime is 1804660107637. The next prime is 1804660107739. The reversal of 1804660107661 is 1667010664081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1798766474761 + 5893632900 = 1341181^2 + 76770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804660107661 - 2²⁵ = 1804626553229 is a prime.

It is a super-2 number, since 2×1804660107661² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1804660107161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902330053830 + 902330053831.

It is an arithmetic number, because the mean of its divisors is an integer number (902330053831).

Almost surely, 2^{1804660107661} is an apocalyptic number.

It is an amenable number.

1804660107661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804660107661 is an equidigital number, since it uses as much as digits as its factorization.

1804660107661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 1804660107661 in words is "one trillion, eight hundred four billion, six hundred sixty million, one hundred seven thousand, six hundred sixty-one".