99511894540 has 48 divisors (see below), whose sum is σ = 211231605312. Its totient is φ = 39375323136.

The previous prime is 99511894529. The next prime is 99511894541. The reversal of 99511894540 is 4549811599.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (99511894541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4398337 + ... + 4420903.

It is an arithmetic number, because the mean of its divisors is an integer number (4400658444).

Almost surely, 2^99511894540 is an apocalyptic number.

It is an amenable number.

99511894540 is an abundant number, since it is smaller than the sum of its proper divisors (111719710772).

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

99511894540 is a wasteful number, since it uses less digits than its factorization.

99511894540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24946 (or 24944 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 99511894540 in words is "ninety-nine billion, five hundred eleven million, eight hundred ninety-four thousand, five hundred forty".