4189887661 has 2 divisors, whose sum is σ = 4189887662. Its totient is φ = 4189887660.

The previous prime is 4189887631. The next prime is 4189887673. The reversal of 4189887661 is 1667889814.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4033012036 + 156875625 = 63506^2 + 12525^2 .

It is a cyclic number.

It is not a de Polignac number, because 4189887661 - 2⁵ = 4189887629 is a prime.

It is a super-2 number, since 2×4189887661² = 35110317223600101842, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 4189887596 and 4189887605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4189887631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2094943830 + 2094943831.

It is an arithmetic number, because the mean of its divisors is an integer number (2094943831).

Almost surely, 2^4189887661 is an apocalyptic number.

It is an amenable number.

4189887661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4189887661 is an equidigital number, since it uses as much as digits as its factorization.

4189887661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 58.

The square root of 4189887661 is about 64729.3415770623. The cubic root of 4189887661 is about 1612.1327214794.

The spelling of 4189887661 in words is "four billion, one hundred eighty-nine million, eight hundred eighty-seven thousand, six hundred sixty-one".