19440451199 has 16 divisors (see below), whose sum is σ = 21617460480. Its totient is φ = 17361146880.

The previous prime is 19440451169. The next prime is 19440451243. The reversal of 19440451199 is 99115404491.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19440451199 - 2⁸ = 19440450943 is a prime.

It is a super-2 number, since 2×19440451199² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440451109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2603279 + ... + 2610735.

It is an arithmetic number, because the mean of its divisors is an integer number (1351091280).

Almost surely, 2^19440451199 is an apocalyptic number.

19440451199 is a deficient number, since it is larger than the sum of its proper divisors (2177009281).

19440451199 is a wasteful number, since it uses less digits than its factorization.

19440451199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13970.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 19440451199 in words is "nineteen billion, four hundred forty million, four hundred fifty-one thousand, one hundred ninety-nine".