666056434144641 has 4 divisors (see below), whose sum is σ = 888075245526192. Its totient is φ = 444037622763092.

The previous prime is 666056434144601. The next prime is 666056434144687. The reversal of 666056434144641 is 146441434650666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666056434144641 - 2¹⁷ = 666056434013569 is a prime.

It is a super-2 number, since 2×666056434144641² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666056434144601) 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, 111009405690771 + ... + 111009405690776.

It is an arithmetic number, because the mean of its divisors is an integer number (222018811381548).

Almost surely, 2^{666056434144641} is an apocalyptic number.

It is an amenable number.

666056434144641 is a deficient number, since it is larger than the sum of its proper divisors (222018811381551).

666056434144641 is a wasteful number, since it uses less digits than its factorization.

666056434144641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222018811381550.

The product of its (nonzero) digits is 119439360, while the sum is 60.

The spelling of 666056434144641 in words is "six hundred sixty-six trillion, fifty-six billion, four hundred thirty-four million, one hundred forty-four thousand, six hundred forty-one".