1066425509 has 4 divisors (see below), whose sum is σ = 1067161920. Its totient is φ = 1065689100.

The previous prime is 1066425491. The next prime is 1066425511. The reversal of 1066425509 is 9055246601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1066425509 - 2²⁰ = 1065376933 is a prime.

It is a super-2 number, since 2×1066425509² = 2274526732491818162, which 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 (1066425599) 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, 366029 + ... + 368930.

It is an arithmetic number, because the mean of its divisors is an integer number (266790480).

Almost surely, 2^1066425509 is an apocalyptic number.

It is an amenable number.

1066425509 is a deficient number, since it is larger than the sum of its proper divisors (736411).

1066425509 is an equidigital number, since it uses as much as digits as its factorization.

1066425509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736410.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1066425509 is about 32656.1710707180. The cubic root of 1066425509 is about 1021.6689034733.

The spelling of 1066425509 in words is "one billion, sixty-six million, four hundred twenty-five thousand, five hundred nine".