1066645623 has 8 divisors (see below), whose sum is σ = 1433051136. Its totient is φ = 705668600.

The previous prime is 1066645577. The next prime is 1066645633. The reversal of 1066645623 is 3265466601.

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 1066645623 - 2²⁰ = 1065597047 is a prime.

It is a super-2 number, since 2×1066645623² = 2275465770130116258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066645633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356663 + ... + 1357448.

It is an arithmetic number, because the mean of its divisors is an integer number (179131392).

Almost surely, 2^1066645623 is an apocalyptic number.

1066645623 is a deficient number, since it is larger than the sum of its proper divisors (366405513).

1066645623 is a wasteful number, since it uses less digits than its factorization.

1066645623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714245.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 1066645623 is about 32659.5410714848. The cubic root of 1066645623 is about 1021.7391906638.

The spelling of 1066645623 in words is "one billion, sixty-six million, six hundred forty-five thousand, six hundred twenty-three".