666605651610 has 32 divisors (see below), whose sum is σ = 1600198027200. Its totient is φ = 177723233408.

The previous prime is 666605651521. The next prime is 666605651611. The reversal of 666605651610 is 16156506666.

It is a self number, because there is not a number n which added to its sum of digits gives 666605651610.

It is not an unprimeable number, because it can be changed into a prime (666605651611) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2250312 + ... + 2529251.

It is an arithmetic number, because the mean of its divisors is an integer number (50006188350).

Almost surely, 2^666605651610 is an apocalyptic number.

666605651610 is an abundant number, since it is smaller than the sum of its proper divisors (933592375590).

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

666605651610 is a wasteful number, since it uses less digits than its factorization.

666605651610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784222.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 666605651610 in words is "six hundred sixty-six billion, six hundred five million, six hundred fifty-one thousand, six hundred ten".