205640152207 has 16 divisors (see below), whose sum is σ = 242624512000. Its totient is φ = 170558809920.

The previous prime is 205640152181. The next prime is 205640152241. The reversal of 205640152207 is 702251046502.

It is a cyclic number.

It is not a de Polignac number, because 205640152207 - 2²³ = 205631763599 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 (205640152007) 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, 2211019 + ... + 2302147.

It is an arithmetic number, because the mean of its divisors is an integer number (15164032000).

Almost surely, 2^205640152207 is an apocalyptic number.

205640152207 is a deficient number, since it is larger than the sum of its proper divisors (36984359793).

205640152207 is a wasteful number, since it uses less digits than its factorization.

205640152207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101566.

The product of its (nonzero) digits is 33600, while the sum is 34.

Adding to 205640152207 its reverse (702251046502), we get a palindrome (907891198709).

The spelling of 205640152207 in words is "two hundred five billion, six hundred forty million, one hundred fifty-two thousand, two hundred seven".