201668866808 has 16 divisors (see below), whose sum is σ = 378134050560. Its totient is φ = 100833120000.

The previous prime is 201668866807. The next prime is 201668866843. The reversal of 201668866808 is 808668866102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201668866807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876233 + ... + 1082183.

It is an arithmetic number, because the mean of its divisors is an integer number (23633378160).

Almost surely, 2^201668866808 is an apocalyptic number.

It is an amenable number.

201668866808 is a deficient number, since it is larger than the sum of its proper divisors (176465183752).

201668866808 is a wasteful number, since it uses less digits than its factorization.

201668866808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328358 (or 328354 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 59.

The spelling of 201668866808 in words is "two hundred one billion, six hundred sixty-eight million, eight hundred sixty-six thousand, eight hundred eight".