206145057253 has 4 divisors (see below), whose sum is σ = 206511212448. Its totient is φ = 205778902060.

The previous prime is 206145057247. The next prime is 206145057301. The reversal of 206145057253 is 352750541602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206145057253 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 (206145657253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183076753 + ... + 183077878.

It is an arithmetic number, because the mean of its divisors is an integer number (51627803112).

Almost surely, 2^206145057253 is an apocalyptic number.

It is an amenable number.

206145057253 is a deficient number, since it is larger than the sum of its proper divisors (366155195).

206145057253 is an equidigital number, since it uses as much as digits as its factorization.

206145057253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366155194.

The product of its (nonzero) digits is 252000, while the sum is 40.

Adding to 206145057253 its reverse (352750541602), we get a palindrome (558895598855).

The spelling of 206145057253 in words is "two hundred six billion, one hundred forty-five million, fifty-seven thousand, two hundred fifty-three".