523115666 has 4 divisors (see below), whose sum is σ = 784673502. Its totient is φ = 261557832.

The previous prime is 523115651. The next prime is 523115689. The reversal of 523115666 is 666511325.

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

It can be written as a sum of positive squares in only one way, i.e., 433264225 + 89851441 = 20815^2 + 9479^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130778915 + ... + 130778918.

Almost surely, 2^523115666 is an apocalyptic number.

523115666 is a deficient number, since it is larger than the sum of its proper divisors (261557836).

523115666 is a wasteful number, since it uses less digits than its factorization.

523115666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261557835.

The product of its digits is 32400, while the sum is 35.

The square root of 523115666 is about 22871.7219727768. The cubic root of 523115666 is about 805.7480109254.

The spelling of 523115666 in words is "five hundred twenty-three million, one hundred fifteen thousand, six hundred sixty-six".