66659077095666 has 128 divisors (see below), whose sum is σ = 157319448514560. Its totient is φ = 18601105228800.

The previous prime is 66659077095629. The next prime is 66659077095679.

66659077095666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66659077095591 and 66659077095600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 167548165 + ... + 167945543.

It is an arithmetic number, because the mean of its divisors is an integer number (1229058191520).

Almost surely, 2^{66659077095666} is an apocalyptic number.

66659077095666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66659077095666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78659724257280).

66659077095666 is an abundant number, since it is smaller than the sum of its proper divisors (90660371418894).

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

66659077095666 is a wasteful number, since it uses less digits than its factorization.

66659077095666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400640.

The product of its (nonzero) digits is 4629441600, while the sum is 78.

The spelling of 66659077095666 in words is "sixty-six trillion, six hundred fifty-nine billion, seventy-seven million, ninety-five thousand, six hundred sixty-six".