99678724816 has 80 divisors (see below), whose sum is σ = 221046852096. Its totient is φ = 43128000000.

The previous prime is 99678724813. The next prime is 99678724819. The reversal of 99678724816 is 61842787699.

It is an interprime number because it is at equal distance from previous prime (99678724813) and next prime (99678724819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99678724811) 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, 183066 + ... + 482566.

Almost surely, 2^99678724816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99678724816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110523426048).

99678724816 is an abundant number, since it is smaller than the sum of its proper divisors (121368127280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99678724816 is a wasteful number, since it uses less digits than its factorization.

99678724816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299612 (or 299606 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 67.

The spelling of 99678724816 in words is "ninety-nine billion, six hundred seventy-eight million, seven hundred twenty-four thousand, eight hundred sixteen".