5161231616 has 72 divisors (see below), whose sum is σ = 10683722280. Its totient is φ = 2485518336.

The previous prime is 5161231601. The next prime is 5161231651. The reversal of 5161231616 is 6161321615.

It can be written as a sum of positive squares in 4 ways, for example, as 1722582016 + 3438649600 = 41504^2 + 58640^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4995836 + ... + 4996868.

Almost surely, 2^5161231616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5161231616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5341861140).

5161231616 is an abundant number, since it is smaller than the sum of its proper divisors (5522490664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5161231616 is a wasteful number, since it uses less digits than its factorization.

5161231616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1737 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 5161231616 is about 71841.7122290386. The cubic root of 5161231616 is about 1728.1619932724.

The spelling of 5161231616 in words is "five billion, one hundred sixty-one million, two hundred thirty-one thousand, six hundred sixteen".