99778487799 has 16 divisors (see below), whose sum is σ = 133177280000. Its totient is φ = 66449388096.

The previous prime is 99778487777. The next prime is 99778487813.

99778487799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99778487799 - 2¹³ = 99778479607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99778487729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15223107 + ... + 15229659.

It is an arithmetic number, because the mean of its divisors is an integer number (8323580000).

Almost surely, 2^99778487799 is an apocalyptic number.

99778487799 is a deficient number, since it is larger than the sum of its proper divisors (33398792201).

99778487799 is a wasteful number, since it uses less digits than its factorization.

99778487799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11094.

The product of its digits is 4032758016, while the sum is 84.

The spelling of 99778487799 in words is "ninety-nine billion, seven hundred seventy-eight million, four hundred eighty-seven thousand, seven hundred ninety-nine".