255516778769 has 8 divisors (see below), whose sum is σ = 293104751040. Its totient is φ = 218200200336.

The previous prime is 255516778763. The next prime is 255516778807. The reversal of 255516778769 is 967877615552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255516778769 - 2¹² = 255516774673 is a prime.

It is a super-2 number, since 2×255516778769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255516778699 and 255516778708.

It is not an unprimeable number, because it can be changed into a prime (255516778763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67846439 + ... + 67850204.

It is an arithmetic number, because the mean of its divisors is an integer number (36638093880).

Almost surely, 2^255516778769 is an apocalyptic number.

It is an amenable number.

255516778769 is a deficient number, since it is larger than the sum of its proper divisors (37587972271).

255516778769 is a wasteful number, since it uses less digits than its factorization.

255516778769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135696919.

The product of its digits is 222264000, while the sum is 68.

The spelling of 255516778769 in words is "two hundred fifty-five billion, five hundred sixteen million, seven hundred seventy-eight thousand, seven hundred sixty-nine".