5166249521 has 4 divisors (see below), whose sum is σ = 5169027444. Its totient is φ = 5163471600.

The previous prime is 5166249503. The next prime is 5166249533. The reversal of 5166249521 is 1259426615.

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 1215498496 + 3950751025 = 34864^2 + 62855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5166249521 is a prime.

It is a super-2 number, since 2×5166249521² = 53380268226465458882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5166243521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386170 + ... + 1389891.

It is an arithmetic number, because the mean of its divisors is an integer number (1292256861).

Almost surely, 2^5166249521 is an apocalyptic number.

It is an amenable number.

5166249521 is a deficient number, since it is larger than the sum of its proper divisors (2777923).

5166249521 is a wasteful number, since it uses less digits than its factorization.

5166249521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777922.

The product of its digits is 129600, while the sum is 41.

The square root of 5166249521 is about 71876.6270841920. The cubic root of 5166249521 is about 1728.7218689348.

The spelling of 5166249521 in words is "five billion, one hundred sixty-six million, two hundred forty-nine thousand, five hundred twenty-one".