1056106661 has 2 divisors, whose sum is σ = 1056106662. Its totient is φ = 1056106660.

The previous prime is 1056106631. The next prime is 1056106687. The reversal of 1056106661 is 1666016501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 882684100 + 173422561 = 29710^2 + 13169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1056106661 is a prime.

It is a super-3 number, since 3×1056106661³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1056106631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528053330 + 528053331.

It is an arithmetic number, because the mean of its divisors is an integer number (528053331).

Almost surely, 2^1056106661 is an apocalyptic number.

It is an amenable number.

1056106661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056106661 is an equidigital number, since it uses as much as digits as its factorization.

1056106661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1056106661 is about 32497.7947097953. The cubic root of 1056106661 is about 1018.3629581169.

The spelling of 1056106661 in words is "one billion, fifty-six million, one hundred six thousand, six hundred sixty-one".