202543640947 has 4 divisors (see below), whose sum is σ = 209077306816. Its totient is φ = 196009975080.

The previous prime is 202543640941. The next prime is 202543641017. The reversal of 202543640947 is 749046345202.

202543640947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202543640947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202543640897 and 202543640906.

It is not an unprimeable number, because it can be changed into a prime (202543640941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3266832888 + ... + 3266832949.

It is an arithmetic number, because the mean of its divisors is an integer number (52269326704).

Almost surely, 2^202543640947 is an apocalyptic number.

202543640947 is a deficient number, since it is larger than the sum of its proper divisors (6533665869).

202543640947 is an equidigital number, since it uses as much as digits as its factorization.

202543640947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6533665868.

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 202543640947 in words is "two hundred two billion, five hundred forty-three million, six hundred forty thousand, nine hundred forty-seven".