7666978255 has 4 divisors (see below), whose sum is σ = 9200373912. Its totient is φ = 6133582600.

The previous prime is 7666978201. The next prime is 7666978279. The reversal of 7666978255 is 5528796667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5528796667 = 479 ⋅11542373.

It is not a de Polignac number, because 7666978255 - 2⁷ = 7666978127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7666978193 and 7666978202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766697821 + ... + 766697830.

It is an arithmetic number, because the mean of its divisors is an integer number (2300093478).

Almost surely, 2^7666978255 is an apocalyptic number.

7666978255 is a deficient number, since it is larger than the sum of its proper divisors (1533395657).

7666978255 is a wasteful number, since it uses less digits than its factorization.

7666978255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533395656.

The product of its digits is 38102400, while the sum is 61.

The square root of 7666978255 is about 87561.2828537819. The cubic root of 7666978255 is about 1971.8539458439.

The spelling of 7666978255 in words is "seven billion, six hundred sixty-six million, nine hundred seventy-eight thousand, two hundred fifty-five".