19005553550 has 36 divisors (see below), whose sum is σ = 36030167880. Its totient is φ = 7458728160.

The previous prime is 19005553549. The next prime is 19005553571. The reversal of 19005553550 is 5535550091.

It is a super-2 number, since 2×19005553550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 72791 + ... + 208109.

Almost surely, 2^19005553550 is an apocalyptic number.

19005553550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19005553550 is a deficient number, since it is larger than the sum of its proper divisors (17024614330).

19005553550 is a wasteful number, since it uses less digits than its factorization.

19005553550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135437 (or 135379 counting only the distinct ones).

The product of its (nonzero) digits is 84375, while the sum is 38.

The spelling of 19005553550 in words is "nineteen billion, five million, five hundred fifty-three thousand, five hundred fifty".