1066860458509 has 4 divisors (see below), whose sum is σ = 1068382371420. Its totient is φ = 1065338545600.

The previous prime is 1066860458501. The next prime is 1066860458557. The reversal of 1066860458509 is 9058540686601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 638365844484 + 428494614025 = 798978^2 + 654595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066860458509 - 2³ = 1066860458501 is a prime.

It is a super-2 number, since 2×1066860458509² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066860458501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760955404 + ... + 760956805.

It is an arithmetic number, because the mean of its divisors is an integer number (267095592855).

Almost surely, 2^{1066860458509} is an apocalyptic number.

It is an amenable number.

1066860458509 is a deficient number, since it is larger than the sum of its proper divisors (1521912911).

1066860458509 is an equidigital number, since it uses as much as digits as its factorization.

1066860458509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521912910.

The product of its (nonzero) digits is 12441600, while the sum is 58.

The spelling of 1066860458509 in words is "one trillion, sixty-six billion, eight hundred sixty million, four hundred fifty-eight thousand, five hundred nine".