9977997799 has 16 divisors (see below), whose sum is σ = 13171873536. Its totient is φ = 7317705600.

The previous prime is 9977997791. The next prime is 9977997853.

9977997799 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 9977997799 - 2³ = 9977997791 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9977997791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3809997 + ... + 3812614.

It is an arithmetic number, because the mean of its divisors is an integer number (823242096).

Almost surely, 2^9977997799 is an apocalyptic number.

9977997799 is a deficient number, since it is larger than the sum of its proper divisors (3193875737).

9977997799 is a wasteful number, since it uses less digits than its factorization.

9977997799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7622646.

The product of its digits is 1275989841, while the sum is 82.

The square root of 9977997799 is about 99889.9284162322. The cubic root of 9977997799 is about 2152.8534529380.

The spelling of 9977997799 in words is "nine billion, nine hundred seventy-seven million, nine hundred ninety-seven thousand, seven hundred ninety-nine".