666042641 has 8 divisors (see below), whose sum is σ = 727478400. Its totient is φ = 604754640.

The previous prime is 666042577. The next prime is 666042653. The reversal of 666042641 is 146240666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666042641 - 2⁶ = 666042577 is a prime.

It is a super-3 number, since 3×666042641³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (666042691) 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, 27401 + ... + 45638.

It is an arithmetic number, because the mean of its divisors is an integer number (90934800).

Almost surely, 2^666042641 is an apocalyptic number.

It is an amenable number.

666042641 is a deficient number, since it is larger than the sum of its proper divisors (61435759).

666042641 is a wasteful number, since it uses less digits than its factorization.

666042641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73879.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 666042641 is about 25807.8019404985. The cubic root of 666042641 is about 873.3078113313.

The spelling of 666042641 in words is "six hundred sixty-six million, forty-two thousand, six hundred forty-one".