1006600781 has 2 divisors, whose sum is σ = 1006600782. Its totient is φ = 1006600780.

The previous prime is 1006600757. The next prime is 1006600789. The reversal of 1006600781 is 1870066001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 944332900 + 62267881 = 30730^2 + 7891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1006600781 - 2¹⁰ = 1006599757 is a prime.

It is a super-2 number, since 2×1006600781² = 2026490264619619922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1006600789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 503300390 + 503300391.

It is an arithmetic number, because the mean of its divisors is an integer number (503300391).

Almost surely, 2^1006600781 is an apocalyptic number.

It is an amenable number.

1006600781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006600781 is an equidigital number, since it uses as much as digits as its factorization.

1006600781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1006600781 is about 31726.9724524733. The cubic root of 1006600781 is about 1002.1954368630.

Adding to 1006600781 its reverse (1870066001), we get a palindrome (2876666782).

The spelling of 1006600781 in words is "one billion, six million, six hundred thousand, seven hundred eighty-one".