99443919978641 has 16 divisors (see below), whose sum is σ = 114286174012800. Its totient is φ = 84760669738368.

The previous prime is 99443919978619. The next prime is 99443919978673. The reversal of 99443919978641 is 14687991934499.

It is a cyclic number.

It is not a de Polignac number, because 99443919978641 - 2⁴² = 95045873467537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99443919978641.

It is not an unprimeable number, because it can be changed into a prime (99443919978841) 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, 163499891 + ... + 164106983.

It is an arithmetic number, because the mean of its divisors is an integer number (7142885875800).

Almost surely, 2^{99443919978641} is an apocalyptic number.

It is an amenable number.

99443919978641 is a deficient number, since it is larger than the sum of its proper divisors (14842254034159).

99443919978641 is a wasteful number, since it uses less digits than its factorization.

99443919978641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738008.

The product of its digits is 3809369088, while the sum is 83.

The spelling of 99443919978641 in words is "ninety-nine trillion, four hundred forty-three billion, nine hundred nineteen million, nine hundred seventy-eight thousand, six hundred forty-one".