9641655655666 has 16 divisors (see below), whose sum is σ = 14595324531480. Its totient is φ = 4776548434560.

The previous prime is 9641655655661. The next prime is 9641655655721. The reversal of 9641655655666 is 6665565561469.

It can be written as a sum of positive squares in 4 ways, for example, as 9608357070225 + 33298585441 = 3099735^2 + 182479^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9641655655595 and 9641655655604.

It is not an unprimeable number, because it can be changed into a prime (9641655655661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27182136 + ... + 27534556.

Almost surely, 2^{9641655655666} is an apocalyptic number.

9641655655666 is a deficient number, since it is larger than the sum of its proper divisors (4953668875814).

9641655655666 is a wasteful number, since it uses less digits than its factorization.

9641655655666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478029.

The product of its digits is 1049760000, while the sum is 70.

The spelling of 9641655655666 in words is "nine trillion, six hundred forty-one billion, six hundred fifty-five million, six hundred fifty-five thousand, six hundred sixty-six".