1066645513 has 4 divisors (see below), whose sum is σ = 1072811268. Its totient is φ = 1060479760.

The previous prime is 1066645507. The next prime is 1066645519. The reversal of 1066645513 is 3155466601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3155466601 = 7 ⋅450780943.

It is an interprime number because it is at equal distance from previous prime (1066645507) and next prime (1066645519).

It can be written as a sum of positive squares in 2 ways, for example, as 615635344 + 451010169 = 24812^2 + 21237^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066645513 - 2⁹ = 1066645001 is a prime.

It is a super-2 number, since 2×1066645513² = 2275465300806066338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066645519) 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, 3082618 + ... + 3082963.

It is an arithmetic number, because the mean of its divisors is an integer number (268202817).

Almost surely, 2^1066645513 is an apocalyptic number.

It is an amenable number.

1066645513 is a deficient number, since it is larger than the sum of its proper divisors (6165755).

1066645513 is an equidigital number, since it uses as much as digits as its factorization.

1066645513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165754.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1066645513 is about 32659.5393874439. The cubic root of 1066645513 is about 1021.7391555408.

The spelling of 1066645513 in words is "one billion, sixty-six million, six hundred forty-five thousand, five hundred thirteen".