1066645261 has 8 divisors (see below), whose sum is σ = 1164901248. Its totient is φ = 968604000.

The previous prime is 1066645249. The next prime is 1066645277. The reversal of 1066645261 is 1625466601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1066645261 - 2⁹ = 1066644749 is a prime.

It is a super-2 number, since 2×1066645261² = 2275464225627516242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1066645261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066645291) 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 in 7 ways as a sum of consecutive naturals, for example, 43200 + ... + 63241.

It is an arithmetic number, because the mean of its divisors is an integer number (145612656).

Almost surely, 2^1066645261 is an apocalyptic number.

1066645261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1066645261 is a deficient number, since it is larger than the sum of its proper divisors (98255987).

1066645261 is a wasteful number, since it uses less digits than its factorization.

1066645261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107363.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1066645261 is about 32659.5355294591. The cubic root of 1066645261 is about 1021.7390750772.

The spelling of 1066645261 in words is "one billion, sixty-six million, six hundred forty-five thousand, two hundred sixty-one".