206400061 has 16 divisors (see below), whose sum is σ = 239984640. Its totient is φ = 173862000.

The previous prime is 206400017. The next prime is 206400071. The reversal of 206400061 is 160004602.

It is a cyclic number.

It is not a de Polignac number, because 206400061 - 2⁷ = 206399933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206400011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138060 + ... + 139546.

It is an arithmetic number, because the mean of its divisors is an integer number (14999040).

Almost surely, 2^206400061 is an apocalyptic number.

It is an amenable number.

206400061 is a deficient number, since it is larger than the sum of its proper divisors (33584579).

206400061 is a wasteful number, since it uses less digits than its factorization.

206400061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 206400061 is about 14366.6301198298. The cubic root of 206400061 is about 590.9761309565.

Adding to 206400061 its reverse (160004602), we get a palindrome (366404663).

The spelling of 206400061 in words is "two hundred six million, four hundred thousand, sixty-one".