99551619840 has 144 divisors (see below), whose sum is σ = 326536505568. Its totient is φ = 25829572608.

The previous prime is 99551619821. The next prime is 99551619851. The reversal of 99551619840 is 4891615599.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208257 + ... + 492416.

It is an arithmetic number, because the mean of its divisors is an integer number (2267614622).

Almost surely, 2^99551619840 is an apocalyptic number.

It is an amenable number.

99551619840 is an abundant number, since it is smaller than the sum of its proper divisors (226984885728).

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

99551619840 is a wasteful number, since it uses less digits than its factorization.

99551619840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700734 (or 700720 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 57.

The spelling of 99551619840 in words is "ninety-nine billion, five hundred fifty-one million, six hundred nineteen thousand, eight hundred forty".