19985403497 has 8 divisors (see below), whose sum is σ = 20435524992. Its totient is φ = 19536319600.

The previous prime is 19985403491. The next prime is 19985403511. The reversal of 19985403497 is 79430458991.

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 19985403497 - 2⁶ = 19985403433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19985403491) 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, 220379 + ... + 297552.

It is an arithmetic number, because the mean of its divisors is an integer number (2554440624).

Almost surely, 2^19985403497 is an apocalyptic number.

It is an amenable number.

19985403497 is a deficient number, since it is larger than the sum of its proper divisors (450121495).

19985403497 is an equidigital number, since it uses as much as digits as its factorization.

19985403497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518799.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 19985403497 in words is "nineteen billion, nine hundred eighty-five million, four hundred three thousand, four hundred ninety-seven".