66659057 has 4 divisors (see below), whose sum is σ = 70580196. Its totient is φ = 62737920.

The previous prime is 66659053. The next prime is 66659093. The reversal of 66659057 is 75095666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75095666 = 2 ⋅37547833.

It can be written as a sum of positive squares in 2 ways, for example, as 36529936 + 30129121 = 6044^2 + 5489^2 .

It is a cyclic number.

It is not a de Polignac number, because 66659057 - 2² = 66659053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66658999 and 66659017.

It is not an unprimeable number, because it can be changed into a prime (66659053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960544 + ... + 1960577.

It is an arithmetic number, because the mean of its divisors is an integer number (17645049).

Almost surely, 2^66659057 is an apocalyptic number.

It is an amenable number.

66659057 is a deficient number, since it is larger than the sum of its proper divisors (3921139).

66659057 is a wasteful number, since it uses less digits than its factorization.

66659057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921138.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 66659057 is about 8164.4998009676. The cubic root of 66659057 is about 405.4647046079.

The spelling of 66659057 in words is "sixty-six million, six hundred fifty-nine thousand, fifty-seven".