99778287799 has 12 divisors (see below), whose sum is σ = 106116794784. Its totient is φ = 93799165184.

The previous prime is 99778287781. The next prime is 99778287803.

99778287799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99778287799 - 2¹⁹ = 99777763511 is a prime.

It is a super-2 number, since 2×99778287799² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99773287799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46242 + ... + 449104.

It is an arithmetic number, because the mean of its divisors is an integer number (8843066232).

Almost surely, 2^99778287799 is an apocalyptic number.

99778287799 is a deficient number, since it is larger than the sum of its proper divisors (6338506985).

99778287799 is a wasteful number, since it uses less digits than its factorization.

99778287799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403754 (or 403737 counting only the distinct ones).

The product of its digits is 2016379008, while the sum is 82.

The spelling of 99778287799 in words is "ninety-nine billion, seven hundred seventy-eight million, two hundred eighty-seven thousand, seven hundred ninety-nine".