666477774666 has 48 divisors (see below), whose sum is σ = 1658222223840. Its totient is φ = 191333331360.

The previous prime is 666477774631. The next prime is 666477774701.

666477774666 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (666477774631) and next prime (666477774701).

It is a junction number, because it is equal to n+sod(n) for n = 666477774594 and 666477774603.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88576485 + ... + 88584008.

It is an arithmetic number, because the mean of its divisors is an integer number (34546296330).

Almost surely, 2^666477774666 is an apocalyptic number.

666477774666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

666477774666 is an abundant number, since it is smaller than the sum of its proper divisors (991744449174).

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

666477774666 is a wasteful number, since it uses less digits than its factorization.

666477774666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177160531 (or 177160528 counting only the distinct ones).

The product of its digits is 1792336896, while the sum is 72.

The spelling of 666477774666 in words is "six hundred sixty-six billion, four hundred seventy-seven million, seven hundred seventy-four thousand, six hundred sixty-six".