99581738181 has 8 divisors (see below), whose sum is σ = 132779530944. Its totient is φ = 66385885440.

The previous prime is 99581738177. The next prime is 99581738183. The reversal of 99581738181 is 18183718599.

It is a happy number.

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

It is not a de Polignac number, because 99581738181 - 2² = 99581738177 is a prime.

It is a super-2 number, since 2×99581738181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99581738183) 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, 360681 + ... + 573806.

It is an arithmetic number, because the mean of its divisors is an integer number (16597441368).

Almost surely, 2^99581738181 is an apocalyptic number.

It is an amenable number.

99581738181 is a deficient number, since it is larger than the sum of its proper divisors (33197792763).

99581738181 is a wasteful number, since it uses less digits than its factorization.

99581738181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970011.

The product of its digits is 4354560, while the sum is 60.

The spelling of 99581738181 in words is "ninety-nine billion, five hundred eighty-one million, seven hundred thirty-eight thousand, one hundred eighty-one".