1611994669 has 2 divisors, whose sum is σ = 1611994670. Its totient is φ = 1611994668.

The previous prime is 1611994649. The next prime is 1611994691. The reversal of 1611994669 is 9664991161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1324013769 + 287980900 = 36387^2 + 16970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611994669 - 2⁹ = 1611994157 is a prime.

It is a super-2 number, since 2×1611994669² = 5197053625768839122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1611994649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805997334 + 805997335.

It is an arithmetic number, because the mean of its divisors is an integer number (805997335).

Almost surely, 2^1611994669 is an apocalyptic number.

It is an amenable number.

1611994669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611994669 is an equidigital number, since it uses as much as digits as its factorization.

1611994669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The square root of 1611994669 is about 40149.6534107083. The cubic root of 1611994669 is about 1172.5225407444.

The spelling of 1611994669 in words is "one billion, six hundred eleven million, nine hundred ninety-four thousand, six hundred sixty-nine".