61166728389 has 16 divisors (see below), whose sum is σ = 87834402432. Its totient is φ = 37638811968.

The previous prime is 61166728387. The next prime is 61166728393. The reversal of 61166728389 is 98382766116.

It is not a de Polignac number, because 61166728389 - 2¹ = 61166728387 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61166728387) 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 15 ways as a sum of consecutive naturals, for example, 812887 + ... + 884939.

It is an arithmetic number, because the mean of its divisors is an integer number (5489650152).

Almost surely, 2^61166728389 is an apocalyptic number.

It is an amenable number.

61166728389 is a deficient number, since it is larger than the sum of its proper divisors (26667674043).

61166728389 is a wasteful number, since it uses less digits than its factorization.

61166728389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93836.

The product of its digits is 5225472, while the sum is 57.

The spelling of 61166728389 in words is "sixty-one billion, one hundred sixty-six million, seven hundred twenty-eight thousand, three hundred eighty-nine".