866788571148261 has 16 divisors (see below), whose sum is σ = 1181700578460864. Its totient is φ = 565011355267584.

The previous prime is 866788571148251. The next prime is 866788571148301. The reversal of 866788571148261 is 162841175887668.

It is not a de Polignac number, because 866788571148261 - 2⁵ = 866788571148229 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 (866788571148221) 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, 17943679966 + ... + 17943728271.

It is an arithmetic number, because the mean of its divisors is an integer number (73856286153804).

Almost surely, 2^{866788571148261} is an apocalyptic number.

It is an amenable number.

866788571148261 is a deficient number, since it is larger than the sum of its proper divisors (314912007312603).

866788571148261 is a wasteful number, since it uses less digits than its factorization.

866788571148261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35887408420.

The product of its digits is 1734082560, while the sum is 78.

The spelling of 866788571148261 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred seventy-one million, one hundred forty-eight thousand, two hundred sixty-one".