61111111689 has 20 divisors (see below), whose sum is σ = 91512689620. Its totient is φ = 40641108480.

The previous prime is 61111111669. The next prime is 61111111697. The reversal of 61111111689 is 98611111116.

61111111689 is a `hidden beast` number, since 611 + 11 + 11 + 16 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 53666355600 + 7444756089 = 231660^2 + 86283^2 .

It is not a de Polignac number, because 61111111689 - 2¹² = 61111107593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61111111609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 889192 + ... + 955449.

It is an arithmetic number, because the mean of its divisors is an integer number (4575634481).

Almost surely, 2^61111111689 is an apocalyptic number.

It is an amenable number.

61111111689 is a deficient number, since it is larger than the sum of its proper divisors (30401577931).

61111111689 is a wasteful number, since it uses less digits than its factorization.

61111111689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845062 (or 1845053 counting only the distinct ones).

The product of its digits is 2592, while the sum is 36.

The spelling of 61111111689 in words is "sixty-one billion, one hundred eleven million, one hundred eleven thousand, six hundred eighty-nine".