666877161 has 8 divisors (see below), whose sum is σ = 889504000. Its totient is φ = 444417552.

The previous prime is 666877117. The next prime is 666877171. The reversal of 666877161 is 161778666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666877161 - 2⁷ = 666877033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666877161.

It is not an unprimeable number, because it can be changed into a prime (666877171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32185 + ... + 48678.

It is an arithmetic number, because the mean of its divisors is an integer number (111188000).

Almost surely, 2^666877161 is an apocalyptic number.

It is an amenable number.

666877161 is a deficient number, since it is larger than the sum of its proper divisors (222626839).

666877161 is a wasteful number, since it uses less digits than its factorization.

666877161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83615.

The product of its digits is 508032, while the sum is 48.

The square root of 666877161 is about 25823.9648582475. The cubic root of 666877161 is about 873.6723969301.

The spelling of 666877161 in words is "six hundred sixty-six million, eight hundred seventy-seven thousand, one hundred sixty-one".