76666566217278 has 16 divisors (see below), whose sum is σ = 154251294906240. Its totient is φ = 25402494993816.

The previous prime is 76666566217273. The next prime is 76666566217309. The reversal of 76666566217278 is 87271266566667.

76666566217278 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76666566217273) 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, 38256768568 + ... + 38256770571.

It is an arithmetic number, because the mean of its divisors is an integer number (9640705931640).

Almost surely, 2^{76666566217278} is an apocalyptic number.

76666566217278 is an abundant number, since it is smaller than the sum of its proper divisors (77584728688962).

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

76666566217278 is a wasteful number, since it uses less digits than its factorization.

76666566217278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76513539311.

The product of its digits is 2560481280, while the sum is 75.

The spelling of 76666566217278 in words is "seventy-six trillion, six hundred sixty-six billion, five hundred sixty-six million, two hundred seventeen thousand, two hundred seventy-eight".