206620656664 has 48 divisors (see below), whose sum is σ = 399783088800. Its totient is φ = 100039008384.

The previous prime is 206620656661. The next prime is 206620656673. The reversal of 206620656664 is 466656026602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206620656661) 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 11 ways as a sum of consecutive naturals, for example, 120900642 + ... + 120902350.

It is an arithmetic number, because the mean of its divisors is an integer number (8328814350).

Almost surely, 2^206620656664 is an apocalyptic number.

It is an amenable number.

206620656664 is a deficient number, since it is larger than the sum of its proper divisors (193162432136).

206620656664 is an equidigital number, since it uses as much as digits as its factorization.

206620656664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700 (or 1987 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 206620656664 in words is "two hundred six billion, six hundred twenty million, six hundred fifty-six thousand, six hundred sixty-four".