57123565666 has 4 divisors (see below), whose sum is σ = 85685348502. Its totient is φ = 28561782832.

The previous prime is 57123565663. The next prime is 57123565669. The reversal of 57123565666 is 66656532175.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (57123565663) and next prime (57123565669).

It can be written as a sum of positive squares in only one way, i.e., 52718456025 + 4405109641 = 229605^2 + 66371^2 .

It is not an unprimeable number, because it can be changed into a prime (57123565663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14280891415 + ... + 14280891418.

Almost surely, 2^57123565666 is an apocalyptic number.

57123565666 is a deficient number, since it is larger than the sum of its proper divisors (28561782836).

57123565666 is a wasteful number, since it uses less digits than its factorization.

57123565666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28561782835.

The product of its digits is 6804000, while the sum is 52.

The spelling of 57123565666 in words is "fifty-seven billion, one hundred twenty-three million, five hundred sixty-five thousand, six hundred sixty-six".