1965163565 has 16 divisors (see below), whose sum is σ = 2386278576. Its totient is φ = 1553472000.

The previous prime is 1965163549. The next prime is 1965163663. The reversal of 1965163565 is 5653615691.

It can be written as a sum of positive squares in 8 ways, for example, as 18412681 + 1946750884 = 4291^2 + 44122^2 .

It is not a de Polignac number, because 1965163565 - 2⁴ = 1965163549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269609 + ... + 276801.

It is an arithmetic number, because the mean of its divisors is an integer number (149142411).

Almost surely, 2^1965163565 is an apocalyptic number.

It is an amenable number.

1965163565 is a deficient number, since it is larger than the sum of its proper divisors (421115011).

1965163565 is a wasteful number, since it uses less digits than its factorization.

1965163565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7840.

The product of its digits is 729000, while the sum is 47.

The square root of 1965163565 is about 44330.1654068649. The cubic root of 1965163565 is about 1252.5629685621.

The spelling of 1965163565 in words is "one billion, nine hundred sixty-five million, one hundred sixty-three thousand, five hundred sixty-five".