202020401656 has 8 divisors (see below), whose sum is σ = 378788253120. Its totient is φ = 101010200824.

The previous prime is 202020401647. The next prime is 202020401683. The reversal of 202020401656 is 656104020202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12626275096 + ... + 12626275111.

It is an arithmetic number, because the mean of its divisors is an integer number (47348531640).

Almost surely, 2^202020401656 is an apocalyptic number.

It is an amenable number.

202020401656 is a deficient number, since it is larger than the sum of its proper divisors (176767851464).

202020401656 is a wasteful number, since it uses less digits than its factorization.

202020401656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25252550213 (or 25252550209 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 202020401656 its reverse (656104020202), we get a palindrome (858124421858).

The spelling of 202020401656 in words is "two hundred two billion, twenty million, four hundred one thousand, six hundred fifty-six".