53660201666 has 4 divisors (see below), whose sum is σ = 80490302502. Its totient is φ = 26830100832.

The previous prime is 53660201629. The next prime is 53660201689. The reversal of 53660201666 is 66610206635.

It is a happy number.

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., 35564302225 + 18095899441 = 188585^2 + 134521^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 13415050415 + ... + 13415050418.

Almost surely, 2^53660201666 is an apocalyptic number.

53660201666 is a deficient number, since it is larger than the sum of its proper divisors (26830100836).

53660201666 is a wasteful number, since it uses less digits than its factorization.

53660201666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26830100835.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 53660201666 in words is "fifty-three billion, six hundred sixty million, two hundred one thousand, six hundred sixty-six".