61659321111 has 12 divisors (see below), whose sum is σ = 89094740280. Its totient is φ = 41091778800.

The previous prime is 61659321091. The next prime is 61659321133. The reversal of 61659321111 is 11112395616.

61659321111 is a `hidden beast` number, since 61 + 6 + 593 + 2 + 1 + 1 + 1 + 1 = 666.

It is not a de Polignac number, because 61659321111 - 2¹¹ = 61659319063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61659322111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1175856 + ... + 1227173.

It is an arithmetic number, because the mean of its divisors is an integer number (7424561690).

Almost surely, 2^61659321111 is an apocalyptic number.

61659321111 is a deficient number, since it is larger than the sum of its proper divisors (27435419169).

61659321111 is a wasteful number, since it uses less digits than its factorization.

61659321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405886 (or 2405883 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The spelling of 61659321111 in words is "sixty-one billion, six hundred fifty-nine million, three hundred twenty-one thousand, one hundred eleven".