201864555956 has 12 divisors (see below), whose sum is σ = 403729111968. Its totient is φ = 86513381112.

The previous prime is 201864555943. The next prime is 201864556013. The reversal of 201864555956 is 659555468102.

It is a happy number.

201864555956 is an admirable number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3604724186 + ... + 3604724241.

It is an arithmetic number, because the mean of its divisors is an integer number (33644092664).

Almost surely, 2^201864555956 is an apocalyptic number.

It is an amenable number.

201864555956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201864555956 is a wasteful number, since it uses less digits than its factorization.

201864555956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209448438 (or 7209448436 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 56.

The spelling of 201864555956 in words is "two hundred one billion, eight hundred sixty-four million, five hundred fifty-five thousand, nine hundred fifty-six".