9997997999 has 8 divisors (see below), whose sum is σ = 11480954880. Its totient is φ = 8610715800.

The previous prime is 9997997951. The next prime is 9997998011.

9997997999 is nontrivially palindromic in base 10.

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 9997997999 - 2⁸ = 9997997743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9997997999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997997909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23918447 + ... + 23918864.

It is an arithmetic number, because the mean of its divisors is an integer number (1435119360).

Almost surely, 2^9997997999 is an apocalyptic number.

9997997999 is a deficient number, since it is larger than the sum of its proper divisors (1482956881).

9997997999 is a wasteful number, since it uses less digits than its factorization.

9997997999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47837341.

The product of its digits is 2109289329, while the sum is 86.

The square root of 9997997999 is about 99989.9894939488. The cubic root of 9997997999 is about 2154.2909077563.

The spelling of 9997997999 in words is "nine billion, nine hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred ninety-nine".