1065664566 has 64 divisors (see below), whose sum is σ = 2556403200. Its totient is φ = 328049568.

The previous prime is 1065664541. The next prime is 1065664619. The reversal of 1065664566 is 6654665601.

It is a super-2 number, since 2×1065664566² = 2271281934455936712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21225 + ... + 50811.

It is an arithmetic number, because the mean of its divisors is an integer number (39943800).

Almost surely, 2^1065664566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1065664566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278201600).

1065664566 is an abundant number, since it is smaller than the sum of its proper divisors (1490738634).

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

1065664566 is a wasteful number, since it uses less digits than its factorization.

1065664566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29650 (or 29644 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 1065664566 is about 32644.5181615536. The cubic root of 1065664566 is about 1021.4258432758.

The spelling of 1065664566 in words is "one billion, sixty-five million, six hundred sixty-four thousand, five hundred sixty-six".