666835161 has 4 divisors (see below), whose sum is σ = 889113552. Its totient is φ = 444556772.

The previous prime is 666835151. The next prime is 666835171. The reversal of 666835161 is 161538666.

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 an interprime number because it is at equal distance from previous prime (666835151) and next prime (666835171).

It is a cyclic number.

It is not a de Polignac number, because 666835161 - 2⁶ = 666835097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666835151) 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, 111139191 + ... + 111139196.

It is an arithmetic number, because the mean of its divisors is an integer number (222278388).

Almost surely, 2^666835161 is an apocalyptic number.

It is an amenable number.

666835161 is a deficient number, since it is larger than the sum of its proper divisors (222278391).

666835161 is a wasteful number, since it uses less digits than its factorization.

666835161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222278390.

The product of its digits is 155520, while the sum is 42.

The square root of 666835161 is about 25823.1516473106. The cubic root of 666835161 is about 873.6540552159.

The spelling of 666835161 in words is "six hundred sixty-six million, eight hundred thirty-five thousand, one hundred sixty-one".