201220477556 has 24 divisors (see below), whose sum is σ = 406425524736. Its totient is φ = 85383511200.

The previous prime is 201220477547. The next prime is 201220477603. The reversal of 201220477556 is 655774022102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35573636 + ... + 35579291.

It is an arithmetic number, because the mean of its divisors is an integer number (16934396864).

Almost surely, 2^201220477556 is an apocalyptic number.

It is an amenable number.

201220477556 is an abundant number, since it is smaller than the sum of its proper divisors (205205047180).

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

201220477556 is a wasteful number, since it uses less digits than its factorization.

201220477556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71153039 (or 71153037 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 41.

Adding to 201220477556 its reverse (655774022102), we get a palindrome (856994499658).

The spelling of 201220477556 in words is "two hundred one billion, two hundred twenty million, four hundred seventy-seven thousand, five hundred fifty-six".