99551649978380 has 96 divisors (see below), whose sum is σ = 218933927460864. Its totient is φ = 37989609525504.

The previous prime is 99551649978371. The next prime is 99551649978409. The reversal of 99551649978380 is 8387994615599.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5267237 + ... + 15061443.

It is an arithmetic number, because the mean of its divisors is an integer number (2280561744384).

Almost surely, 2^{99551649978380} 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 99551649978380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109466963730432).

99551649978380 is an abundant number, since it is smaller than the sum of its proper divisors (119382277482484).

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

99551649978380 is a wasteful number, since it uses less digits than its factorization.

99551649978380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9794535 (or 9794533 counting only the distinct ones).

The product of its (nonzero) digits is 5290790400, while the sum is 83.

The spelling of 99551649978380 in words is "ninety-nine trillion, five hundred fifty-one billion, six hundred forty-nine million, nine hundred seventy-eight thousand, three hundred eighty".