775245385457 has 4 divisors (see below), whose sum is σ = 775248069540. Its totient is φ = 775242701376.

The previous prime is 775245385451. The next prime is 775245385477. The reversal of 775245385457 is 754583542577.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754583542577 = 47 ⋅16054968991.

It can be written as a sum of positive squares in 2 ways, for example, as 744244388416 + 31000997041 = 862696^2 + 176071^2 .

It is a cyclic number.

It is not a de Polignac number, because 775245385457 - 2²⁴ = 775228608241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 775245385457.

It is not an unprimeable number, because it can be changed into a prime (775245385451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 848228 + ... + 1506645.

It is an arithmetic number, because the mean of its divisors is an integer number (193812017385).

Almost surely, 2^775245385457 is an apocalyptic number.

It is an amenable number.

775245385457 is a deficient number, since it is larger than the sum of its proper divisors (2684083).

775245385457 is a wasteful number, since it uses less digits than its factorization.

775245385457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684082.

The product of its digits is 164640000, while the sum is 62.

The spelling of 775245385457 in words is "seven hundred seventy-five billion, two hundred forty-five million, three hundred eighty-five thousand, four hundred fifty-seven".