206766720625 has 10 divisors (see below), whose sum is σ = 258375694874. Its totient is φ = 165413376000.

The previous prime is 206766720581. The next prime is 206766720661. The reversal of 206766720625 is 526027667602.

It can be written as a sum of positive squares in 5 ways, for example, as 17157856144 + 189608864481 = 130988^2 + 435441^2 .

It is not a de Polignac number, because 206766720625 - 2⁷ = 206766720497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 165412752 + ... + 165414001.

Almost surely, 2^206766720625 is an apocalyptic number.

206766720625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206766720625 is a deficient number, since it is larger than the sum of its proper divisors (51608974249).

206766720625 is an frugal number, since it uses more digits than its factorization.

206766720625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330826773 (or 330826758 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 206766720625 in words is "two hundred six billion, seven hundred sixty-six million, seven hundred twenty thousand, six hundred twenty-five".