9776656566778 has 8 divisors (see below), whose sum is σ = 14666565667572. Its totient is φ = 4887801344256.

The previous prime is 9776656566757. The next prime is 9776656566779. The reversal of 9776656566778 is 8776656566779.

It can be written as a sum of positive squares in 2 ways, for example, as 9691435193449 + 85221373329 = 3113107^2 + 291927^2 .

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

It is a super-4 number, since 4×9776656566778⁴ (a number of 53 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9776656566695 and 9776656566704.

It is not an unprimeable number, because it can be changed into a prime (9776656566779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263446375 + ... + 263483482.

Almost surely, 2^{9776656566778} is an apocalyptic number.

9776656566778 is a deficient number, since it is larger than the sum of its proper divisors (4889909100794).

9776656566778 is a wasteful number, since it uses less digits than its factorization.

9776656566778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526939136.

The product of its digits is 33606316800, while the sum is 85.

Subtracting from 9776656566778 its reverse (8776656566779), we obtain a palindrome (999999999999).

The spelling of 9776656566778 in words is "nine trillion, seven hundred seventy-six billion, six hundred fifty-six million, five hundred sixty-six thousand, seven hundred seventy-eight".