9991716377 has 4 divisors (see below), whose sum is σ = 9998809140. Its totient is φ = 9984623616.

The previous prime is 9991716349. The next prime is 9991716421. The reversal of 9991716377 is 7736171999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2485919881 + 7505796496 = 49859^2 + 86636^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991716377 - 2⁶ = 9991716313 is a prime.

It is a super-2 number, since 2×9991716377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991916377) 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, 3544268 + ... + 3547085.

It is an arithmetic number, because the mean of its divisors is an integer number (2499702285).

Almost surely, 2^9991716377 is an apocalyptic number.

It is an amenable number.

9991716377 is a deficient number, since it is larger than the sum of its proper divisors (7092763).

9991716377 is a wasteful number, since it uses less digits than its factorization.

9991716377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7092762.

The product of its digits is 4500846, while the sum is 59.

The square root of 9991716377 is about 99958.5733041444. The cubic root of 9991716377 is about 2153.8396415380.

The spelling of 9991716377 in words is "nine billion, nine hundred ninety-one million, seven hundred sixteen thousand, three hundred seventy-seven".