99999995881 has 2 divisors, whose sum is σ = 99999995882. Its totient is φ = 99999995880.

The previous prime is 99999995833. The next prime is 99999995891. The reversal of 99999995881 is 18859999999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77414715225 + 22585280656 = 278235^2 + 150284^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999995881 - 2¹¹ = 99999993833 is a prime.

It is a super-2 number, since 2×99999995881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99999995831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999997940 + 49999997941.

It is an arithmetic number, because the mean of its divisors is an integer number (49999997941).

Almost surely, 2^99999995881 is an apocalyptic number.

It is an amenable number.

99999995881 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999995881 is an equidigital number, since it uses as much as digits as its factorization.

99999995881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1530550080, while the sum is 85.

The spelling of 99999995881 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-five thousand, eight hundred eighty-one".