9997777999 has 16 divisors (see below), whose sum is σ = 11080364544. Its totient is φ = 8944689600.

The previous prime is 9997777991. The next prime is 9997778051.

9997777999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9997777999 - 2³ = 9997777991 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 (9997777991) 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, 358344 + ... + 385234.

It is an arithmetic number, because the mean of its divisors is an integer number (692522784).

Almost surely, 2^9997777999 is an apocalyptic number.

9997777999 is a deficient number, since it is larger than the sum of its proper divisors (1082586545).

9997777999 is a wasteful number, since it uses less digits than its factorization.

9997777999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27438.

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

The square root of 9997777999 is about 99988.8893777704. The cubic root of 9997777999 is about 2154.2751063436.

The spelling of 9997777999 in words is "nine billion, nine hundred ninety-seven million, seven hundred seventy-seven thousand, nine hundred ninety-nine".