56601610666 has 4 divisors (see below), whose sum is σ = 84902416002. Its totient is φ = 28300805332.

The previous prime is 56601610627. The next prime is 56601610729. The reversal of 56601610666 is 66601610665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66601610665 = 5 ⋅13320322133.

It can be written as a sum of positive squares in only one way, i.e., 39473345041 + 17128265625 = 198679^2 + 130875^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14150402665 + ... + 14150402668.

Almost surely, 2^56601610666 is an apocalyptic number.

56601610666 is a deficient number, since it is larger than the sum of its proper divisors (28300805336).

56601610666 is a wasteful number, since it uses less digits than its factorization.

56601610666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28300805335.

The product of its (nonzero) digits is 233280, while the sum is 43.

Subtracting 56601610666 from its reverse (66601610665), we obtain a palindrome (9999999999).

The spelling of 56601610666 in words is "fifty-six billion, six hundred one million, six hundred ten thousand, six hundred sixty-six".