19138812250 has 16 divisors (see below), whose sum is σ = 35827857000. Its totient is φ = 7655524800.

The previous prime is 19138812169. The next prime is 19138812263. The reversal of 19138812250 is 5221883191.

It can be written as a sum of positive squares in 4 ways, for example, as 2706392529 + 16432419721 = 52023^2 + 128189^2 .

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, 38277375 + ... + 38277874.

Almost surely, 2^19138812250 is an apocalyptic number.

19138812250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19138812250 is a deficient number, since it is larger than the sum of its proper divisors (16689044750).

19138812250 is an equidigital number, since it uses as much as digits as its factorization.

19138812250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76555266 (or 76555256 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 19138812250 in words is "nineteen billion, one hundred thirty-eight million, eight hundred twelve thousand, two hundred fifty".