19450625378 has 18 divisors (see below), whose sum is σ = 30998468163. Its totient is φ = 9151657600.

The previous prime is 19450625353. The next prime is 19450625503. The reversal of 19450625378 is 87352605491.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 18931833649 + 518791729 = 137593^2 + 22777^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=98617.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3350078 + ... + 3355878.

It is a 1-persistent number, because it is pandigital, but 2⋅19450625378 = 38901250756 is not.

Almost surely, 2^19450625378 is an apocalyptic number.

19450625378 is a deficient number, since it is larger than the sum of its proper divisors (11547842785).

19450625378 is an frugal number, since it uses more digits than its factorization.

19450625378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11638 (or 5820 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

Multiplying 19450625378 by its sum of digits (50), we get a square (972531268900 = 986170²).

The spelling of 19450625378 in words is "nineteen billion, four hundred fifty million, six hundred twenty-five thousand, three hundred seventy-eight".