656543453666 has 32 divisors (see below), whose sum is σ = 1070342208000. Its totient is φ = 300890643840.

The previous prime is 656543453653. The next prime is 656543453681. The reversal of 656543453666 is 666354345656.

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 in 15 ways as a sum of consecutive naturals, for example, 5059046 + ... + 5187198.

It is an arithmetic number, because the mean of its divisors is an integer number (33448194000).

Almost surely, 2^656543453666 is an apocalyptic number.

656543453666 is a deficient number, since it is larger than the sum of its proper divisors (413798754334).

656543453666 is a wasteful number, since it uses less digits than its factorization.

656543453666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132554.

The product of its digits is 139968000, while the sum is 59.

The spelling of 656543453666 in words is "six hundred fifty-six billion, five hundred forty-three million, four hundred fifty-three thousand, six hundred sixty-six".