99910188861 has 16 divisors (see below), whose sum is σ = 161199633024. Its totient is φ = 53733210624.

The previous prime is 99910188817. The next prime is 99910188863. The reversal of 99910188861 is 16888101999.

It is not a de Polignac number, because 99910188861 - 2⁶ = 99910188797 is a prime.

It is a super-4 number, since 4×99910188861⁴ (a number of 45 digits) contains 4444 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99910188795 and 99910188804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99910188863) 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, 139929880 + ... + 139930593.

It is an arithmetic number, because the mean of its divisors is an integer number (10074977064).

Almost surely, 2^99910188861 is an apocalyptic number.

It is an amenable number.

99910188861 is a deficient number, since it is larger than the sum of its proper divisors (61289444163).

99910188861 is a wasteful number, since it uses less digits than its factorization.

99910188861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279860500.

The product of its (nonzero) digits is 2239488, while the sum is 60.

The spelling of 99910188861 in words is "ninety-nine billion, nine hundred ten million, one hundred eighty-eight thousand, eight hundred sixty-one".