775727608516 has 81 divisors (see below), whose sum is σ = 1610874516909. Its totient is φ = 325907164128.

The previous prime is 775727608483. The next prime is 775727608519. The reversal of 775727608516 is 615806727577.

The square root of 775727608516 is 880754.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 559219796100 + 216507812416 = 747810^2 + 465304^2 .

It is a super-2 number, since 2×775727608516² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (775727608519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 653518875 + ... + 653520061.

Almost surely, 2^775727608516 is an apocalyptic number.

775727608516 is the 880754-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775727608516

775727608516 is an abundant number, since it is smaller than the sum of its proper divisors (835146908393).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

775727608516 is an equidigital number, since it uses as much as digits as its factorization.

775727608516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498 (or 1249 counting only the distinct ones).

The product of its (nonzero) digits is 34574400, while the sum is 61.

The spelling of 775727608516 in words is "seven hundred seventy-five billion, seven hundred twenty-seven million, six hundred eight thousand, five hundred sixteen".