6550161565 has 4 divisors (see below), whose sum is σ = 7860193884. Its totient is φ = 5240129248.

The previous prime is 6550161539. The next prime is 6550161571. The reversal of 6550161565 is 5651610556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2199703801 + 4350457764 = 46901^2 + 65958^2 .

It is a cyclic number.

It is not a de Polignac number, because 6550161565 - 2²³ = 6541772957 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 3 ways as a sum of consecutive naturals, for example, 655016152 + ... + 655016161.

It is an arithmetic number, because the mean of its divisors is an integer number (1965048471).

Almost surely, 2^6550161565 is an apocalyptic number.

It is an amenable number.

6550161565 is a deficient number, since it is larger than the sum of its proper divisors (1310032319).

6550161565 is a wasteful number, since it uses less digits than its factorization.

6550161565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310032318.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 6550161565 is about 80933.0684269415. The cubic root of 6550161565 is about 1871.0440150938.

The spelling of 6550161565 in words is "six billion, five hundred fifty million, one hundred sixty-one thousand, five hundred sixty-five".