19451189551850 has 48 divisors (see below), whose sum is σ = 42127816290048. Its totient is φ = 6543149471040.

The previous prime is 19451189551831. The next prime is 19451189551853. The reversal of 19451189551850 is 5815598115491.

It is not an unprimeable number, because it can be changed into a prime (19451189551853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 524272274 + ... + 524309373.

It is an arithmetic number, because the mean of its divisors is an integer number (877662839376).

Almost surely, 2^{19451189551850} is an apocalyptic number.

19451189551850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19451189551850 is an abundant number, since it is smaller than the sum of its proper divisors (22676626738198).

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

19451189551850 is a wasteful number, since it uses less digits than its factorization.

19451189551850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048581719 (or 1048581714 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 62.

The spelling of 19451189551850 in words is "nineteen trillion, four hundred fifty-one billion, one hundred eighty-nine million, five hundred fifty-one thousand, eight hundred fifty".