5161556161 has 4 divisors (see below), whose sum is σ = 5168429824. Its totient is φ = 5154682500.

The previous prime is 5161556089. The next prime is 5161556189. The reversal of 5161556161 is 1616551615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5161556161 - 2²¹ = 5159459009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5161556161.

It is not an unprimeable number, because it can be changed into a prime (5161056161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3435705 + ... + 3437206.

It is an arithmetic number, because the mean of its divisors is an integer number (1292107456).

Almost surely, 2^5161556161 is an apocalyptic number.

It is an amenable number.

5161556161 is a deficient number, since it is larger than the sum of its proper divisors (6873663).

5161556161 is an equidigital number, since it uses as much as digits as its factorization.

5161556161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6873662.

The product of its digits is 27000, while the sum is 37.

The square root of 5161556161 is about 71843.9709439839. The cubic root of 5161556161 is about 1728.1982155426.

The spelling of 5161556161 in words is "five billion, one hundred sixty-one million, five hundred fifty-six thousand, one hundred sixty-one".