755916686521 has 2 divisors, whose sum is σ = 755916686522. Its totient is φ = 755916686520.

The previous prime is 755916686489. The next prime is 755916686537. The reversal of 755916686521 is 125686619557.

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., 732633283600 + 23283402921 = 855940^2 + 152589^2 .

It is an emirp because it is prime and its reverse (125686619557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 755916686521 - 2⁵ = 755916686489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 755916686521.

It is not a weakly prime, because it can be changed into another prime (755916686321) 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, 377958343260 + 377958343261.

It is an arithmetic number, because the mean of its divisors is an integer number (377958343261).

Almost surely, 2^755916686521 is an apocalyptic number.

It is an amenable number.

755916686521 is a deficient number, since it is larger than the sum of its proper divisors (1).

755916686521 is an equidigital number, since it uses as much as digits as its factorization.

755916686521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216000, while the sum is 61.

The spelling of 755916686521 in words is "seven hundred fifty-five billion, nine hundred sixteen million, six hundred eighty-six thousand, five hundred twenty-one".