1565643066 has 32 divisors (see below), whose sum is σ = 3374457408. Its totient is φ = 481407360.

The previous prime is 1565643061. The next prime is 1565643091. The reversal of 1565643066 is 6603465651.

It is a super-2 number, since 2×1565643066² = 4902476420227760712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1565643061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124006 + ... + 136046.

It is an arithmetic number, because the mean of its divisors is an integer number (105451794).

Almost surely, 2^1565643066 is an apocalyptic number.

1565643066 is an abundant number, since it is smaller than the sum of its proper divisors (1808814342).

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

1565643066 is a wasteful number, since it uses less digits than its factorization.

1565643066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13726.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 1565643066 is about 39568.2077683587. The cubic root of 1565643066 is about 1161.1747576757.

The spelling of 1565643066 in words is "one billion, five hundred sixty-five million, six hundred forty-three thousand, sixty-six".