1565065664 has 28 divisors (see below), whose sum is σ = 3189619224. Its totient is φ = 761382144.

The previous prime is 1565065661. The next prime is 1565065727. The reversal of 1565065664 is 4665605651.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1565065661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328094 + ... + 332829.

Almost surely, 2^1565065664 is an apocalyptic number.

It is an amenable number.

1565065664 is an abundant number, since it is smaller than the sum of its proper divisors (1624553560).

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

1565065664 is an equidigital number, since it uses as much as digits as its factorization.

1565065664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660972 (or 660962 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 1565065664 is about 39560.9108085241. The cubic root of 1565065664 is about 1161.0319948114.

The spelling of 1565065664 in words is "one billion, five hundred sixty-five million, sixty-five thousand, six hundred sixty-four".