99145031680 has 112 divisors (see below), whose sum is σ = 240615810360. Its totient is φ = 39210975232.

The previous prime is 99145031663. The next prime is 99145031743. The reversal of 99145031680 is 8613054199.

It can be written as a sum of positive squares in 4 ways, for example, as 67284209664 + 31860822016 = 259392^2 + 178496^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99145031680.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3631842 + ... + 3659038.

Almost surely, 2^99145031680 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 99145031680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120307905180).

99145031680 is an abundant number, since it is smaller than the sum of its proper divisors (141470778680).

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

99145031680 is an equidigital number, since it uses as much as digits as its factorization.

99145031680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27317 (or 27293 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 99145031680 in words is "ninety-nine billion, one hundred forty-five million, thirty-one thousand, six hundred eighty".