19451619240 has 32 divisors (see below), whose sum is σ = 58354858080. Its totient is φ = 5187098432.

The previous prime is 19451619211. The next prime is 19451619251. The reversal of 19451619240 is 4291615491.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19451619192 and 19451619201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81048294 + ... + 81048533.

It is an arithmetic number, because the mean of its divisors is an integer number (1823589315).

Almost surely, 2^19451619240 is an apocalyptic number.

19451619240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19451619240 is an abundant number, since it is smaller than the sum of its proper divisors (38903238840).

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

19451619240 is a wasteful number, since it uses less digits than its factorization.

19451619240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162096841 (or 162096837 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 19451619240 in words is "nineteen billion, four hundred fifty-one million, six hundred nineteen thousand, two hundred forty".