19990554450 has 48 divisors (see below), whose sum is σ = 49629278880. Its totient is φ = 5325147520.

The previous prime is 19990554407. The next prime is 19990554461. The reversal of 19990554450 is 5445509991.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19990554393 and 19990554402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71686 + ... + 212414.

It is an arithmetic number, because the mean of its divisors is an integer number (1033943310).

Almost surely, 2^19990554450 is an apocalyptic number.

19990554450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19990554450 is an abundant number, since it is smaller than the sum of its proper divisors (29638724430).

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

19990554450 is a wasteful number, since it uses less digits than its factorization.

19990554450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141691 (or 141686 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 51.

The spelling of 19990554450 in words is "nineteen billion, nine hundred ninety million, five hundred fifty-four thousand, four hundred fifty".