19491660239 has 8 divisors (see below), whose sum is σ = 19718622000. Its totient is φ = 19265573952.

The previous prime is 19491660229. The next prime is 19491660281. The reversal of 19491660239 is 93206619491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19491660239 is a prime.

It is a super-2 number, since 2×19491660239² (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 (19491660229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174029 + ... + 263190.

It is an arithmetic number, because the mean of its divisors is an integer number (2464827750).

Almost surely, 2^19491660239 is an apocalyptic number.

19491660239 is a deficient number, since it is larger than the sum of its proper divisors (226961761).

19491660239 is a wasteful number, since it uses less digits than its factorization.

19491660239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437737.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 19491660239 in words is "nineteen billion, four hundred ninety-one million, six hundred sixty thousand, two hundred thirty-nine".