201555550 has 48 divisors (see below), whose sum is σ = 432686592. Its totient is φ = 68421600.

The previous prime is 201555547. The next prime is 201555559. The reversal of 201555550 is 55555102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201555559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33255 + ... + 38845.

It is an arithmetic number, because the mean of its divisors is an integer number (9014304).

Almost surely, 2^201555550 is an apocalyptic number.

201555550 is an abundant number, since it is smaller than the sum of its proper divisors (231131042).

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

201555550 is a wasteful number, since it uses less digits than its factorization.

201555550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713 (or 5708 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 201555550 is about 14197.0260970388. The cubic root of 201555550 is about 586.3157857203.

The spelling of 201555550 in words is "two hundred one million, five hundred fifty-five thousand, five hundred fifty".