99404382181 has 8 divisors (see below), whose sum is σ = 108032992760. Its totient is φ = 90916074432.

The previous prime is 99404382097. The next prime is 99404382211. The reversal of 99404382181 is 18128340499.

It can be written as a sum of positive squares in 4 ways, for example, as 9998000100 + 89406382081 = 99990^2 + 299009^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99404382181 - 2⁹ = 99404381669 is a prime.

It is a super-2 number, since 2×99404382181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99404382881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35074230 + ... + 35077063.

It is an arithmetic number, because the mean of its divisors is an integer number (13504124095).

Almost surely, 2^99404382181 is an apocalyptic number.

It is an amenable number.

99404382181 is a deficient number, since it is larger than the sum of its proper divisors (8628610579).

99404382181 is a wasteful number, since it uses less digits than its factorization.

99404382181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70151415.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 99404382181 in words is "ninety-nine billion, four hundred four million, three hundred eighty-two thousand, one hundred eighty-one".