5165761261 has 2 divisors, whose sum is σ = 5165761262. Its totient is φ = 5165761260.

The previous prime is 5165761103. The next prime is 5165761277. The reversal of 5165761261 is 1621675615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4098432361 + 1067328900 = 64019^2 + 32670^2 .

It is a cyclic number.

It is not a de Polignac number, because 5165761261 - 2¹³ = 5165753069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5165765261) 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 as a sum of consecutive naturals, namely, 2582880630 + 2582880631.

It is an arithmetic number, because the mean of its divisors is an integer number (2582880631).

Almost surely, 2^5165761261 is an apocalyptic number.

It is an amenable number.

5165761261 is a deficient number, since it is larger than the sum of its proper divisors (1).

5165761261 is an equidigital number, since it uses as much as digits as its factorization.

5165761261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 5165761261 is about 71873.2304895223. The cubic root of 5165761261 is about 1728.6674069679.

The spelling of 5165761261 in words is "five billion, one hundred sixty-five million, seven hundred sixty-one thousand, two hundred sixty-one".