206400157 has 2 divisors, whose sum is σ = 206400158. Its totient is φ = 206400156.

The previous prime is 206400119. The next prime is 206400209. The reversal of 206400157 is 751004602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130553476 + 75846681 = 11426^2 + 8709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206400157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206403157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103200078 + 103200079.

It is an arithmetic number, because the mean of its divisors is an integer number (103200079).

Almost surely, 2^206400157 is an apocalyptic number.

It is an amenable number.

206400157 is a deficient number, since it is larger than the sum of its proper divisors (1).

206400157 is an equidigital number, since it uses as much as digits as its factorization.

206400157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 206400157 is about 14366.6334609052. The cubic root of 206400157 is about 590.9762225807.

Adding to 206400157 its reverse (751004602), we get a palindrome (957404759).

The spelling of 206400157 in words is "two hundred six million, four hundred thousand, one hundred fifty-seven".