9997456729927 has 4 divisors (see below), whose sum is σ = 10241297138016. Its totient is φ = 9753616321840.

The previous prime is 9997456729879. The next prime is 9997456729937. The reversal of 9997456729927 is 7299276547999.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997456729927 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 (9997456729937) 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, 121920203983 + ... + 121920204064.

It is an arithmetic number, because the mean of its divisors is an integer number (2560324284504).

Almost surely, 2^{9997456729927} is an apocalyptic number.

9997456729927 is a deficient number, since it is larger than the sum of its proper divisors (243840408089).

9997456729927 is a wasteful number, since it uses less digits than its factorization.

9997456729927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243840408088.

The product of its digits is 9721827360, while the sum is 85.

The spelling of 9997456729927 in words is "nine trillion, nine hundred ninety-seven billion, four hundred fifty-six million, seven hundred twenty-nine thousand, nine hundred twenty-seven".