1006656881 has 2 divisors, whose sum is σ = 1006656882. Its totient is φ = 1006656880.

The previous prime is 1006656869. The next prime is 1006656913. The reversal of 1006656881 is 1886566001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723879025 + 282777856 = 26905^2 + 16816^2 .

It is an emirp because it is prime and its reverse (1886566001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1006656881 - 2¹⁰ = 1006655857 is a prime.

It is a super-2 number, since 2×1006656881² = 2026716152129296322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1006656811) 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, 503328440 + 503328441.

It is an arithmetic number, because the mean of its divisors is an integer number (503328441).

Almost surely, 2^1006656881 is an apocalyptic number.

It is an amenable number.

1006656881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006656881 is an equidigital number, since it uses as much as digits as its factorization.

1006656881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1006656881 is about 31727.8565459440. The cubic root of 1006656881 is about 1002.2140546774.

The spelling of 1006656881 in words is "one billion, six million, six hundred fifty-six thousand, eight hundred eighty-one".