666057761 has 8 divisors (see below), whose sum is σ = 691989480. Its totient is φ = 640323712.

The previous prime is 666057709. The next prime is 666057797. The reversal of 666057761 is 167750666.

666057761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2016400 + 664041361 = 1420^2 + 25769^2 .

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

It is not a de Polignac number, because 666057761 - 2¹⁴ = 666041377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666057061) 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, 42530 + ... + 56043.

It is an arithmetic number, because the mean of its divisors is an integer number (86498685).

Almost surely, 2^666057761 is an apocalyptic number.

It is an amenable number.

666057761 is a deficient number, since it is larger than the sum of its proper divisors (25931719).

666057761 is a wasteful number, since it uses less digits than its factorization.

666057761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98835.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 666057761 is about 25808.0948735082. The cubic root of 666057761 is about 873.3144196740.

The spelling of 666057761 in words is "six hundred sixty-six million, fifty-seven thousand, seven hundred sixty-one".