866500161 has 4 divisors (see below), whose sum is σ = 1155333552. Its totient is φ = 577666772.

The previous prime is 866500153. The next prime is 866500171. The reversal of 866500161 is 161005668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866500161 - 2³ = 866500153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866500121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144416691 + ... + 144416696.

It is an arithmetic number, because the mean of its divisors is an integer number (288833388).

Almost surely, 2^866500161 is an apocalyptic number.

It is an amenable number.

866500161 is a deficient number, since it is larger than the sum of its proper divisors (288833391).

866500161 is a wasteful number, since it uses less digits than its factorization.

866500161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288833390.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 866500161 is about 29436.3747937819. The cubic root of 866500161 is about 953.3584404878.

The spelling of 866500161 in words is "eight hundred sixty-six million, five hundred thousand, one hundred sixty-one".