1125667661 has 2 divisors, whose sum is σ = 1125667662. Its totient is φ = 1125667660.

The previous prime is 1125667607. The next prime is 1125667681. The reversal of 1125667661 is 1667665211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1077086761 + 48580900 = 32819^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125667661 - 2¹⁸ = 1125405517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125667601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562833830 + 562833831.

It is an arithmetic number, because the mean of its divisors is an integer number (562833831).

Almost surely, 2^1125667661 is an apocalyptic number.

It is an amenable number.

1125667661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125667661 is an equidigital number, since it uses as much as digits as its factorization.

1125667661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 1125667661 is about 33550.9710887777. The cubic root of 1125667661 is about 1040.2476176293.

The spelling of 1125667661 in words is "one billion, one hundred twenty-five million, six hundred sixty-seven thousand, six hundred sixty-one".