205216507 has 2 divisors, whose sum is σ = 205216508. Its totient is φ = 205216506.

The previous prime is 205216493. The next prime is 205216577. The reversal of 205216507 is 705612502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205216507 - 2¹⁵ = 205183739 is a prime.

It is a super-2 number, since 2×205216507² = 84227629490562098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205216577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102608253 + 102608254.

It is an arithmetic number, because the mean of its divisors is an integer number (102608254).

Almost surely, 2^205216507 is an apocalyptic number.

205216507 is a deficient number, since it is larger than the sum of its proper divisors (1).

205216507 is an equidigital number, since it uses as much as digits as its factorization.

205216507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 205216507 is about 14325.3798204446. The cubic root of 205216507 is about 589.8443590224.

It can be divided in two parts, 20521 and 6507, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 205216507 in words is "two hundred five million, two hundred sixteen thousand, five hundred seven".