61111111099 has 4 divisors (see below), whose sum is σ = 61477046064. Its totient is φ = 60745176136.

The previous prime is 61111111091. The next prime is 61111111121. The reversal of 61111111099 is 99011111116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61111111099 - 2³ = 61111111091 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 61111111099.

It is not an unprimeable number, because it can be changed into a prime (61111111091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182967232 + ... + 182967565.

It is an arithmetic number, because the mean of its divisors is an integer number (15369261516).

Almost surely, 2^61111111099 is an apocalyptic number.

61111111099 is a deficient number, since it is larger than the sum of its proper divisors (365934965).

61111111099 is a wasteful number, since it uses less digits than its factorization.

61111111099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365934964.

The product of its (nonzero) digits is 486, while the sum is 31.

The spelling of 61111111099 in words is "sixty-one billion, one hundred eleven million, one hundred eleven thousand, ninety-nine".