168009977 has 4 divisors (see below), whose sum is σ = 168072036. Its totient is φ = 167947920.

The previous prime is 168009971. The next prime is 168009979. The reversal of 168009977 is 779900861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779900861 = 3583 ⋅217667.

It can be written as a sum of positive squares in 2 ways, for example, as 24393721 + 143616256 = 4939^2 + 11984^2 .

It is a cyclic number.

It is not a de Polignac number, because 168009977 - 2¹² = 168005881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168009971) 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, 26774 + ... + 32447.

It is an arithmetic number, because the mean of its divisors is an integer number (42018009).

Almost surely, 2^168009977 is an apocalyptic number.

It is an amenable number.

168009977 is a deficient number, since it is larger than the sum of its proper divisors (62059).

168009977 is an equidigital number, since it uses as much as digits as its factorization.

168009977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62058.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 168009977 is about 12961.8662622325. The cubic root of 168009977 is about 551.7957579912.

The spelling of 168009977 in words is "one hundred sixty-eight million, nine thousand, nine hundred seventy-seven".