616256761 has 2 divisors, whose sum is σ = 616256762. Its totient is φ = 616256760.

The previous prime is 616256743. The next prime is 616256777. The reversal of 616256761 is 167652616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500909161 + 115347600 = 22381^2 + 10740^2 .

It is a cyclic number.

It is not a de Polignac number, because 616256761 - 2²⁹ = 79385849 is a prime.

It is a super-2 number, since 2×616256761² = 759544790956422242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (616256701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308128380 + 308128381.

It is an arithmetic number, because the mean of its divisors is an integer number (308128381).

Almost surely, 2^616256761 is an apocalyptic number.

It is an amenable number.

616256761 is a deficient number, since it is larger than the sum of its proper divisors (1).

616256761 is an equidigital number, since it uses as much as digits as its factorization.

616256761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 616256761 is about 24824.5193508354. The cubic root of 616256761 is about 850.9823756144.

It can be divided in two parts, 61625 and 6761, that added together give a palindrome (68386).

The spelling of 616256761 in words is "six hundred sixteen million, two hundred fifty-six thousand, seven hundred sixty-one".