205155550 has 24 divisors (see below), whose sum is σ = 386823456. Its totient is φ = 80936640.

The previous prime is 205155539. The next prime is 205155553. The reversal of 205155550 is 55551502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205155553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24454 + ... + 31753.

It is an arithmetic number, because the mean of its divisors is an integer number (16117644).

Almost surely, 2^205155550 is an apocalyptic number.

205155550 is a deficient number, since it is larger than the sum of its proper divisors (181667906).

205155550 is a wasteful number, since it uses less digits than its factorization.

205155550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56292 (or 56287 counting only the distinct ones).

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

The square root of 205155550 is about 14323.2520748607. The cubic root of 205155550 is about 589.7859512726.

The spelling of 205155550 in words is "two hundred five million, one hundred fifty-five thousand, five hundred fifty".