56666601 has 8 divisors (see below), whose sum is σ = 83950560. Its totient is φ = 37777716.

The previous prime is 56666579. The next prime is 56666653. The reversal of 56666601 is 10666665.

56666601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56666601 - 2⁷ = 56666473 is a prime.

It is a super-2 number, since 2×56666601² = 6422207337786402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56666671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049355 + ... + 1049408.

It is an arithmetic number, because the mean of its divisors is an integer number (10493820).

Almost surely, 2^56666601 is an apocalyptic number.

It is an amenable number.

56666601 is a deficient number, since it is larger than the sum of its proper divisors (27283959).

56666601 is a wasteful number, since it uses less digits than its factorization.

56666601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098772 (or 2098766 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 56666601 is about 7527.7221654362. The cubic root of 56666601 is about 384.0983024695.

It can be divided in two parts, 5666660 and 1, that added together give a triangular number (5666661 = T₃₃₆₆).

The spelling of 56666601 in words is "fifty-six million, six hundred sixty-six thousand, six hundred one".