9993715997 has 4 divisors (see below), whose sum is σ = 9997894620. Its totient is φ = 9989537376.

The previous prime is 9993715967. The next prime is 9993716009. The reversal of 9993715997 is 7995173999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7995173999 = 509 ⋅15707611.

It can be written as a sum of positive squares in 2 ways, for example, as 139381636 + 9854334361 = 11806^2 + 99269^2 .

It is a cyclic number.

It is not a de Polignac number, because 9993715997 - 2⁶ = 9993715933 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 (9993715967) 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, 2085722 + ... + 2090507.

It is an arithmetic number, because the mean of its divisors is an integer number (2499473655).

Almost surely, 2^9993715997 is an apocalyptic number.

It is an amenable number.

9993715997 is a deficient number, since it is larger than the sum of its proper divisors (4178623).

9993715997 is a wasteful number, since it uses less digits than its factorization.

9993715997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178622.

The product of its digits is 43401015, while the sum is 68.

The square root of 9993715997 is about 99968.5750473618. The cubic root of 9993715997 is about 2153.9833130017.

The spelling of 9993715997 in words is "nine billion, nine hundred ninety-three million, seven hundred fifteen thousand, nine hundred ninety-seven".