203640644002253 has 4 divisors (see below), whose sum is σ = 203668099941180. Its totient is φ = 203613188063328.

The previous prime is 203640644002247. The next prime is 203640644002273. The reversal of 203640644002253 is 352200446046302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168075200641924 + 35565443360329 = 12964382^2 + 5963677^2 .

It is a cyclic number.

It is not a de Polignac number, because 203640644002253 - 2³⁰ = 203639570260429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203640644002253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203640644002223) 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, 13727958338 + ... + 13727973171.

It is an arithmetic number, because the mean of its divisors is an integer number (50917024985295).

Almost surely, 2^{203640644002253} is an apocalyptic number.

It is an amenable number.

203640644002253 is a deficient number, since it is larger than the sum of its proper divisors (27455938927).

203640644002253 is an equidigital number, since it uses as much as digits as its factorization.

203640644002253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27455938926.

The product of its (nonzero) digits is 829440, while the sum is 41.

The spelling of 203640644002253 in words is "two hundred three trillion, six hundred forty billion, six hundred forty-four million, two thousand, two hundred fifty-three".