666554427201 has 32 divisors (see below), whose sum is σ = 1017347482368. Its totient is φ = 384556400640.

The previous prime is 666554427197. The next prime is 666554427211. The reversal of 666554427201 is 102724455666.

It is not a de Polignac number, because 666554427201 - 2² = 666554427197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666554427211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1785565 + ... + 2126346.

It is an arithmetic number, because the mean of its divisors is an integer number (31792108824).

Almost surely, 2^666554427201 is an apocalyptic number.

It is an amenable number.

666554427201 is a deficient number, since it is larger than the sum of its proper divisors (350793055167).

666554427201 is a wasteful number, since it uses less digits than its factorization.

666554427201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912201.

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 666554427201 in words is "six hundred sixty-six billion, five hundred fifty-four million, four hundred twenty-seven thousand, two hundred one".