5166125813 has 4 divisors (see below), whose sum is σ = 5219384940. Its totient is φ = 5112866688.

The previous prime is 5166125803. The next prime is 5166125819. The reversal of 5166125813 is 3185216615.

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 3348126769 + 1817999044 = 57863^2 + 42638^2 .

It is a cyclic number.

It is not a de Polignac number, because 5166125813 - 2⁸ = 5166125557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5166125819) 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, 26629418 + ... + 26629611.

It is an arithmetic number, because the mean of its divisors is an integer number (1304846235).

Almost surely, 2^5166125813 is an apocalyptic number.

It is an amenable number.

5166125813 is a deficient number, since it is larger than the sum of its proper divisors (53259127).

5166125813 is an equidigital number, since it uses as much as digits as its factorization.

5166125813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53259126.

The product of its digits is 43200, while the sum is 38.

The square root of 5166125813 is about 71875.7665211301. The cubic root of 5166125813 is about 1728.7080705026.

The spelling of 5166125813 in words is "five billion, one hundred sixty-six million, one hundred twenty-five thousand, eight hundred thirteen".