66012661 has 8 divisors (see below), whose sum is σ = 77553504. Its totient is φ = 55395120.

The previous prime is 66012647. The next prime is 66012743. The reversal of 66012661 is 16621066.

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

It is not a de Polignac number, because 66012661 - 2¹¹ = 66010613 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 (66012601) 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, 230671 + ... + 230956.

It is an arithmetic number, because the mean of its divisors is an integer number (9694188).

Almost surely, 2^66012661 is an apocalyptic number.

It is an amenable number.

66012661 is a deficient number, since it is larger than the sum of its proper divisors (11540843).

66012661 is a wasteful number, since it uses less digits than its factorization.

66012661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461651.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66012661 is about 8124.8175979526. The cubic root of 66012661 is about 404.1498418948.

The spelling of 66012661 in words is "sixty-six million, twelve thousand, six hundred sixty-one".