19051985450 has 12 divisors (see below), whose sum is σ = 35436693030. Its totient is φ = 7620794160.

The previous prime is 19051985417. The next prime is 19051985453. The reversal of 19051985450 is 5458915091.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17846020921 + 1205964529 = 133589^2 + 34727^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19051985395 and 19051985404.

It is not an unprimeable number, because it can be changed into a prime (19051985453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190519805 + ... + 190519904.

Almost surely, 2^19051985450 is an apocalyptic number.

19051985450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19051985450 is a deficient number, since it is larger than the sum of its proper divisors (16384707580).

19051985450 is a wasteful number, since it uses less digits than its factorization.

19051985450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381039721 (or 381039716 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 47.

The spelling of 19051985450 in words is "nineteen billion, fifty-one million, nine hundred eighty-five thousand, four hundred fifty".