1010668661 has 2 divisors, whose sum is σ = 1010668662. Its totient is φ = 1010668660.

The previous prime is 1010668619. The next prime is 1010668697. The reversal of 1010668661 is 1668660101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 889888561 + 120780100 = 29831^2 + 10990^2 .

It is an emirp because it is prime and its reverse (1668660101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1010668661 - 2⁶ = 1010668597 is a prime.

It is a super-2 number, since 2×1010668661² = 2042902284655065842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010668361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505334330 + 505334331.

It is an arithmetic number, because the mean of its divisors is an integer number (505334331).

Almost surely, 2^1010668661 is an apocalyptic number.

It is an amenable number.

1010668661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010668661 is an equidigital number, since it uses as much as digits as its factorization.

1010668661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1010668661 is about 31791.0154131635. The cubic root of 1010668661 is about 1003.5436480587.

The spelling of 1010668661 in words is "one billion, ten million, six hundred sixty-eight thousand, six hundred sixty-one".