19497403735847 has 4 divisors (see below), whose sum is σ = 19497421187736. Its totient is φ = 19497386283960.

The previous prime is 19497403735811. The next prime is 19497403735891. The reversal of 19497403735847 is 74853730479491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19497403735847 - 2¹⁸ = 19497403473703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19497403725847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6926429 + ... + 9325782.

It is an arithmetic number, because the mean of its divisors is an integer number (4874355296934).

Almost surely, 2^{19497403735847} is an apocalyptic number.

19497403735847 is a deficient number, since it is larger than the sum of its proper divisors (17451889).

19497403735847 is a wasteful number, since it uses less digits than its factorization.

19497403735847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17451888.

The product of its (nonzero) digits is 640120320, while the sum is 71.

The spelling of 19497403735847 in words is "nineteen trillion, four hundred ninety-seven billion, four hundred three million, seven hundred thirty-five thousand, eight hundred forty-seven".