66654755745666 has 64 divisors (see below), whose sum is σ = 149366205480960. Its totient is φ = 19651567584960.

The previous prime is 66654755745647. The next prime is 66654755745673.

It is a happy number.

66654755745666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66654755745591 and 66654755745600.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51242845 + ... + 52527503.

It is an arithmetic number, because the mean of its divisors is an integer number (2333846960640).

Almost surely, 2^{66654755745666} is an apocalyptic number.

66654755745666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66654755745666 is an abundant number, since it is smaller than the sum of its proper divisors (82711449735294).

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

66654755745666 is a wasteful number, since it uses less digits than its factorization.

66654755745666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305959.

The product of its digits is 22861440000, while the sum is 78.

The spelling of 66654755745666 in words is "sixty-six trillion, six hundred fifty-four billion, seven hundred fifty-five million, seven hundred forty-five thousand, six hundred sixty-six".