1066616261 has 16 divisors (see below), whose sum is σ = 1156425984. Its totient is φ = 979928064.

The previous prime is 1066616249. The next prime is 1066616267. The reversal of 1066616261 is 1626166601.

It is a cyclic number.

It is not a de Polignac number, because 1066616261 - 2⁶ = 1066616197 is a prime.

It is a super-2 number, since 2×1066616261² = 2275340496459240242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066616267) 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 in 15 ways as a sum of consecutive naturals, for example, 344426 + ... + 347508.

It is an arithmetic number, because the mean of its divisors is an integer number (72276624).

Almost surely, 2^1066616261 is an apocalyptic number.

It is an amenable number.

1066616261 is a deficient number, since it is larger than the sum of its proper divisors (89809723).

1066616261 is a wasteful number, since it uses less digits than its factorization.

1066616261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1066616261 is about 32659.0915519706. The cubic root of 1066616261 is about 1021.7298152971.

The spelling of 1066616261 in words is "one billion, sixty-six million, six hundred sixteen thousand, two hundred sixty-one".