755561857 has 2 divisors, whose sum is σ = 755561858. Its totient is φ = 755561856.

The previous prime is 755561837. The next prime is 755561861. The reversal of 755561857 is 758165557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725979136 + 29582721 = 26944^2 + 5439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-755561857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 755561857.

It is not a weakly prime, because it can be changed into another prime (755561837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 377780928 + 377780929.

It is an arithmetic number, because the mean of its divisors is an integer number (377780929).

Almost surely, 2^755561857 is an apocalyptic number.

It is an amenable number.

755561857 is a deficient number, since it is larger than the sum of its proper divisors (1).

755561857 is an equidigital number, since it uses as much as digits as its factorization.

755561857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1470000, while the sum is 49.

The square root of 755561857 is about 27487.4854615696. The cubic root of 755561857 is about 910.8006707546.

The spelling of 755561857 in words is "seven hundred fifty-five million, five hundred sixty-one thousand, eight hundred fifty-seven".