666455413767078 has 128 divisors (see below), whose sum is σ = 1498113381582720. Its totient is φ = 196240177889280.

The previous prime is 666455413767041. The next prime is 666455413767127. The reversal of 666455413767078 is 870767314554666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 196964526 + ... + 200319582.

It is an arithmetic number, because the mean of its divisors is an integer number (11704010793615).

Almost surely, 2^{666455413767078} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666455413767078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749056690791360).

666455413767078 is an abundant number, since it is smaller than the sum of its proper divisors (831657967815642).

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

666455413767078 is a wasteful number, since it uses less digits than its factorization.

666455413767078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355882.

The product of its (nonzero) digits is 4267468800, while the sum is 75.

The spelling of 666455413767078 in words is "six hundred sixty-six trillion, four hundred fifty-five billion, four hundred thirteen million, seven hundred sixty-seven thousand, seventy-eight".