1066644636 has 12 divisors (see below), whose sum is σ = 2488837512. Its totient is φ = 355548208.

The previous prime is 1066644611. The next prime is 1066644637. The reversal of 1066644636 is 6364466601.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1066644636² = 2275461559015144992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066644637) 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, 44443515 + ... + 44443538.

It is an arithmetic number, because the mean of its divisors is an integer number (207403126).

Almost surely, 2^1066644636 is an apocalyptic number.

It is an amenable number.

1066644636 is an abundant number, since it is smaller than the sum of its proper divisors (1422192876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1066644636 is a wasteful number, since it uses less digits than its factorization.

1066644636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88887060 (or 88887058 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 1066644636 is about 32659.5259610424. The cubic root of 1066644636 is about 1021.7388755148.

The spelling of 1066644636 in words is "one billion, sixty-six million, six hundred forty-four thousand, six hundred thirty-six".