19444191850 has 24 divisors (see below), whose sum is σ = 36173404620. Its totient is φ = 7776126720.

The previous prime is 19444191839. The next prime is 19444191857. The reversal of 19444191850 is 5819144491.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13374691201 + 6069500649 = 115649^2 + 77907^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19444191850.

It is not an unprimeable number, because it can be changed into a prime (19444191857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233596 + ... + 305704.

Almost surely, 2^19444191850 is an apocalyptic number.

19444191850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19444191850 is a deficient number, since it is larger than the sum of its proper divisors (16729212770).

19444191850 is a wasteful number, since it uses less digits than its factorization.

19444191850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77514 (or 77509 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 19444191850 in words is "nineteen billion, four hundred forty-four million, one hundred ninety-one thousand, eight hundred fifty".