199955044550 has 192 divisors, whose sum is σ = 397483130880. Its totient is φ = 74758464000.

The previous prime is 199955044519. The next prime is 199955044561. The reversal of 199955044550 is 55440559991.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1046884955 + ... + 1046885145.

It is an arithmetic number, because the mean of its divisors is an integer number (2070224640).

Almost surely, 2^199955044550 is an apocalyptic number.

199955044550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199955044550 is a deficient number, since it is larger than the sum of its proper divisors (197528086330).

199955044550 is a wasteful number, since it uses less digits than its factorization.

199955044550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 7290000, while the sum is 56.

The spelling of 199955044550 in words is "one hundred ninety-nine billion, nine hundred fifty-five million, forty-four thousand, five hundred fifty".