223391665666 has 32 divisors (see below), whose sum is σ = 361569584880. Its totient is φ = 102902317056.

The previous prime is 223391665663. The next prime is 223391665751. The reversal of 223391665666 is 666566193322.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 21426811641 + 201964854025 = 146379^2 + 449405^2 .

It is a super-3 number, since 3×223391665666³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (223391665663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31923280 + ... + 31930276.

Almost surely, 2^223391665666 is an apocalyptic number.

223391665666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

223391665666 is a deficient number, since it is larger than the sum of its proper divisors (138177919214).

223391665666 is a wasteful number, since it uses less digits than its factorization.

223391665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9238.

The product of its digits is 12597120, while the sum is 55.

The spelling of 223391665666 in words is "two hundred twenty-three billion, three hundred ninety-one million, six hundred sixty-five thousand, six hundred sixty-six".