66051661 has 8 divisors (see below), whose sum is σ = 71406720. Its totient is φ = 60735792.

The previous prime is 66051659. The next prime is 66051679. The reversal of 66051661 is 16615066.

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

It is not a de Polignac number, because 66051661 - 2¹ = 66051659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66051611) 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, 6241 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (8925840).

Almost surely, 2^66051661 is an apocalyptic number.

It is an amenable number.

66051661 is a deficient number, since it is larger than the sum of its proper divisors (5355059).

66051661 is a wasteful number, since it uses less digits than its factorization.

66051661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19595.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66051661 is about 8127.2172974518. The cubic root of 66051661 is about 404.2294162300.

The spelling of 66051661 in words is "sixty-six million, fifty-one thousand, six hundred sixty-one".