6401666611 has 8 divisors (see below), whose sum is σ = 6506408160. Its totient is φ = 6297715968.

The previous prime is 6401666603. The next prime is 6401666699. The reversal of 6401666611 is 1166661046.

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 6401666611 - 2³ = 6401666603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6401666311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181396 + ... + 213793.

It is an arithmetic number, because the mean of its divisors is an integer number (813301020).

Almost surely, 2^6401666611 is an apocalyptic number.

6401666611 is a deficient number, since it is larger than the sum of its proper divisors (104741549).

6401666611 is a wasteful number, since it uses less digits than its factorization.

6401666611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395453.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 6401666611 is about 80010.4156407152. The cubic root of 6401666611 is about 1856.7966803539.

The spelling of 6401666611 in words is "six billion, four hundred one million, six hundred sixty-six thousand, six hundred eleven".