260616557 has 2 divisors, whose sum is σ = 260616558. Its totient is φ = 260616556.

The previous prime is 260616553. The next prime is 260616581. The reversal of 260616557 is 755616062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229189321 + 31427236 = 15139^2 + 5606^2 .

It is a cyclic number.

It is not a de Polignac number, because 260616557 - 2² = 260616553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260616557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260616553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130308278 + 130308279.

It is an arithmetic number, because the mean of its divisors is an integer number (130308279).

Almost surely, 2^260616557 is an apocalyptic number.

It is an amenable number.

260616557 is a deficient number, since it is larger than the sum of its proper divisors (1).

260616557 is an equidigital number, since it uses as much as digits as its factorization.

260616557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 260616557 is about 16143.6227966340. The cubic root of 260616557 is about 638.7545415787.

The spelling of 260616557 in words is "two hundred sixty million, six hundred sixteen thousand, five hundred fifty-seven".