866075121 has 12 divisors (see below), whose sum is σ = 1251294772. Its totient is φ = 577246176.

The previous prime is 866075059. The next prime is 866075123. The reversal of 866075121 is 121570668.

866075121 is a `hidden beast` number, since 86 + 60 + 7 + 512 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 780420096 + 85655025 = 27936^2 + 9255^2 .

It is not a de Polignac number, because 866075121 - 2¹⁸ = 865812977 is a prime.

It is a super-2 number, since 2×866075121² = 1500172230430329282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866075123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41355 + ... + 58671.

Almost surely, 2^866075121 is an apocalyptic number.

It is an amenable number.

866075121 is a deficient number, since it is larger than the sum of its proper divisors (385219651).

866075121 is a wasteful number, since it uses less digits than its factorization.

866075121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880 (or 22877 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 866075121 is about 29429.1542691937. The cubic root of 866075121 is about 953.2025329400.

The spelling of 866075121 in words is "eight hundred sixty-six million, seventy-five thousand, one hundred twenty-one".