19440099061 has 8 divisors (see below), whose sum is σ = 19931297760. Its totient is φ = 18950677872.

The previous prime is 19440099043. The next prime is 19440099079. The reversal of 19440099061 is 16099004491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19440099043) and next prime (19440099079).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19440099061 - 2¹¹ = 19440097013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19440098999 and 19440099017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440099361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422215 + ... + 465988.

It is an arithmetic number, because the mean of its divisors is an integer number (2491412220).

Almost surely, 2^19440099061 is an apocalyptic number.

It is an amenable number.

19440099061 is a deficient number, since it is larger than the sum of its proper divisors (491198699).

19440099061 is an equidigital number, since it uses as much as digits as its factorization.

19440099061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888755.

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 19440099061 in words is "nineteen billion, four hundred forty million, ninety-nine thousand, sixty-one".