5161566565 has 8 divisors (see below), whose sum is σ = 6194818080. Its totient is φ = 4128627792.

The previous prime is 5161566559. The next prime is 5161566587. The reversal of 5161566565 is 5656651615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5161566565 - 2¹⁷ = 5161435493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40195 + ... + 109264.

It is an arithmetic number, because the mean of its divisors is an integer number (774352260).

Almost surely, 2^5161566565 is an apocalyptic number.

It is an amenable number.

5161566565 is a deficient number, since it is larger than the sum of its proper divisors (1033251515).

5161566565 is a wasteful number, since it uses less digits than its factorization.

5161566565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156371.

The product of its digits is 810000, while the sum is 46.

The square root of 5161566565 is about 71844.0433508583. The cubic root of 5161566565 is about 1728.1993767016.

The spelling of 5161566565 in words is "five billion, one hundred sixty-one million, five hundred sixty-six thousand, five hundred sixty-five".