99779297799 has 16 divisors (see below), whose sum is σ = 134073396864. Its totient is φ = 66002508000.

The previous prime is 99779297777. The next prime is 99779297809.

99779297799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99779297799 - 2¹⁷ = 99779166727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99779297719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3878272 + ... + 3903914.

It is an arithmetic number, because the mean of its divisors is an integer number (8379587304).

Almost surely, 2^99779297799 is an apocalyptic number.

99779297799 is a deficient number, since it is larger than the sum of its proper divisors (34294099065).

99779297799 is a wasteful number, since it uses less digits than its factorization.

99779297799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35678.

The product of its digits is 2551979682, while the sum is 84.

The spelling of 99779297799 in words is "ninety-nine billion, seven hundred seventy-nine million, two hundred ninety-seven thousand, seven hundred ninety-nine".