206164551 has 4 divisors (see below), whose sum is σ = 274886072. Its totient is φ = 137443032.

The previous prime is 206164547. The next prime is 206164583. The reversal of 206164551 is 155461602.

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

It is not a de Polignac number, because 206164551 - 2² = 206164547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206164531) 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 3 ways as a sum of consecutive naturals, for example, 34360756 + ... + 34360761.

It is an arithmetic number, because the mean of its divisors is an integer number (68721518).

Almost surely, 2^206164551 is an apocalyptic number.

206164551 is a deficient number, since it is larger than the sum of its proper divisors (68721521).

206164551 is an equidigital number, since it uses as much as digits as its factorization.

206164551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68721520.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 206164551 is about 14358.4313558271. The cubic root of 206164551 is about 590.7512703011.

The spelling of 206164551 in words is "two hundred six million, one hundred sixty-four thousand, five hundred fifty-one".