1565220165 has 16 divisors (see below), whose sum is σ = 2541732288. Its totient is φ = 822324096.

The previous prime is 1565220143. The next prime is 1565220169. The reversal of 1565220165 is 5610225651.

It is not a de Polignac number, because 1565220165 - 2⁷ = 1565220037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1565220169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777712 + ... + 779721.

It is an arithmetic number, because the mean of its divisors is an integer number (158858268).

Almost surely, 2^1565220165 is an apocalyptic number.

1565220165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1565220165 is a deficient number, since it is larger than the sum of its proper divisors (976512123).

1565220165 is a wasteful number, since it uses less digits than its factorization.

1565220165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557508.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1565220165 is about 39562.8634580461. The cubic root of 1565220165 is about 1161.0701986827.

The spelling of 1565220165 in words is "one billion, five hundred sixty-five million, two hundred twenty thousand, one hundred sixty-five".