666337057 has 4 divisors (see below), whose sum is σ = 666397060. Its totient is φ = 666277056.

The previous prime is 666337039. The next prime is 666337079. The reversal of 666337057 is 750733666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 750733666 = 2 ⋅375366833.

It can be written as a sum of positive squares in 2 ways, for example, as 524226816 + 142110241 = 22896^2 + 11921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666337057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666367057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7932 + ... + 37357.

It is an arithmetic number, because the mean of its divisors is an integer number (166599265).

Almost surely, 2^666337057 is an apocalyptic number.

It is an amenable number.

666337057 is a deficient number, since it is larger than the sum of its proper divisors (60003).

666337057 is a wasteful number, since it uses less digits than its factorization.

666337057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60002.

The product of its (nonzero) digits is 476280, while the sum is 43.

The square root of 666337057 is about 25813.5053218272. The cubic root of 666337057 is about 873.4364707199.

The spelling of 666337057 in words is "six hundred sixty-six million, three hundred thirty-seven thousand, fifty-seven".