206696645 has 4 divisors (see below), whose sum is σ = 248035980. Its totient is φ = 165357312.

The previous prime is 206696639. The next prime is 206696663. The reversal of 206696645 is 546696602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67881121 + 138815524 = 8239^2 + 11782^2 .

It is a cyclic number.

It is not a de Polignac number, because 206696645 - 2⁴ = 206696629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206696596 and 206696605.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20669660 + ... + 20669669.

It is an arithmetic number, because the mean of its divisors is an integer number (62008995).

Almost surely, 2^206696645 is an apocalyptic number.

It is an amenable number.

206696645 is a deficient number, since it is larger than the sum of its proper divisors (41339335).

206696645 is an equidigital number, since it uses as much as digits as its factorization.

206696645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41339334.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 206696645 is about 14376.9483896966. The cubic root of 206696645 is about 591.2590607488.

The spelling of 206696645 in words is "two hundred six million, six hundred ninety-six thousand, six hundred forty-five".