1066615213 has 4 divisors (see below), whose sum is σ = 1070864928. Its totient is φ = 1062365500.

The previous prime is 1066615183. The next prime is 1066615219. The reversal of 1066615213 is 3125166601.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3125166601 = 71 ⋅44016431.

It is a cyclic number.

It is not a de Polignac number, because 1066615213 - 2⁵ = 1066615181 is a prime.

It is a super-2 number, since 2×1066615213² = 2275336025206070738, 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 (1066615219) 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 3 ways as a sum of consecutive naturals, for example, 2124481 + ... + 2124982.

It is an arithmetic number, because the mean of its divisors is an integer number (267716232).

Almost surely, 2^1066615213 is an apocalyptic number.

It is an amenable number.

1066615213 is a deficient number, since it is larger than the sum of its proper divisors (4249715).

1066615213 is an equidigital number, since it uses as much as digits as its factorization.

1066615213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249714.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1066615213 is about 32659.0755074298. The cubic root of 1066615213 is about 1021.7294806647.

The spelling of 1066615213 in words is "one billion, sixty-six million, six hundred fifteen thousand, two hundred thirteen".