1057086661 has 2 divisors, whose sum is σ = 1057086662. Its totient is φ = 1057086660.

The previous prime is 1057086649. The next prime is 1057086689. The reversal of 1057086661 is 1666807501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762312100 + 294774561 = 27610^2 + 17169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1057086661 - 2⁷ = 1057086533 is a prime.

It is a super-2 number, since 2×1057086661² = 2234864417728257842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1057086691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528543330 + 528543331.

It is an arithmetic number, because the mean of its divisors is an integer number (528543331).

Almost surely, 2^1057086661 is an apocalyptic number.

It is an amenable number.

1057086661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1057086661 is an equidigital number, since it uses as much as digits as its factorization.

1057086661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1057086661 is about 32512.8691597650. The cubic root of 1057086661 is about 1018.6778528154.

The spelling of 1057086661 in words is "one billion, fifty-seven million, eighty-six thousand, six hundred sixty-one".