66057761 has 32 divisors (see below), whose sum is σ = 85764096. Its totient is φ = 49392000.

The previous prime is 66057749. The next prime is 66057793. The reversal of 66057761 is 16775066.

It is not a de Polignac number, because 66057761 - 2⁶ = 66057697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66057721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234941 + ... + 235221.

It is an arithmetic number, because the mean of its divisors is an integer number (2680128).

Almost surely, 2^66057761 is an apocalyptic number.

It is an amenable number.

66057761 is a deficient number, since it is larger than the sum of its proper divisors (19706335).

66057761 is a wasteful number, since it uses less digits than its factorization.

66057761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 66057761 is about 8127.5925709893. The cubic root of 66057761 is about 404.2418596392.

The spelling of 66057761 in words is "sixty-six million, fifty-seven thousand, seven hundred sixty-one".