19997243345 has 8 divisors (see below), whose sum is σ = 23999953920. Its totient is φ = 15995620080.

The previous prime is 19997243317. The next prime is 19997243359. The reversal of 19997243345 is 54334279991.

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

It is not a de Polignac number, because 19997243345 - 2¹⁴ = 19997226961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230801 + ... + 305390.

It is an arithmetic number, because the mean of its divisors is an integer number (2999994240).

Almost surely, 2^19997243345 is an apocalyptic number.

It is an amenable number.

19997243345 is a deficient number, since it is larger than the sum of its proper divisors (4002710575).

19997243345 is an equidigital number, since it uses as much as digits as its factorization.

19997243345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543655.

The product of its digits is 7348320, while the sum is 56.

The spelling of 19997243345 in words is "nineteen billion, nine hundred ninety-seven million, two hundred forty-three thousand, three hundred forty-five".