66055647 has 16 divisors (see below), whose sum is σ = 105954560. Its totient is φ = 35759232.

The previous prime is 66055643. The next prime is 66055663. The reversal of 66055647 is 74655066.

It is not a de Polignac number, because 66055647 - 2² = 66055643 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 (66055643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82378 + ... + 83175.

It is an arithmetic number, because the mean of its divisors is an integer number (6622160).

Almost surely, 2^66055647 is an apocalyptic number.

66055647 is a deficient number, since it is larger than the sum of its proper divisors (39898913).

66055647 is a wasteful number, since it uses less digits than its factorization.

66055647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165582.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66055647 is about 8127.4625191384. The cubic root of 66055647 is about 404.2375473707.

The spelling of 66055647 in words is "sixty-six million, fifty-five thousand, six hundred forty-seven".