5185578257 has 2 divisors, whose sum is σ = 5185578258. Its totient is φ = 5185578256.

The previous prime is 5185578217. The next prime is 5185578283. The reversal of 5185578257 is 7528755815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5019580801 + 165997456 = 70849^2 + 12884^2 .

It is a cyclic number.

It is not a de Polignac number, because 5185578257 - 2¹⁰ = 5185577233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5185578199 and 5185578208.

It is not a weakly prime, because it can be changed into another prime (5185578217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2592789128 + 2592789129.

It is an arithmetic number, because the mean of its divisors is an integer number (2592789129).

Almost surely, 2^5185578257 is an apocalyptic number.

It is an amenable number.

5185578257 is a deficient number, since it is larger than the sum of its proper divisors (1).

5185578257 is an equidigital number, since it uses as much as digits as its factorization.

5185578257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920000, while the sum is 53.

The square root of 5185578257 is about 72010.9592839868. The cubic root of 5185578257 is about 1730.8751023874.

The spelling of 5185578257 in words is "five billion, one hundred eighty-five million, five hundred seventy-eight thousand, two hundred fifty-seven".