168920178001 has 3 divisors (see below), whose sum is σ = 168920589001. Its totient is φ = 168919767002.

The previous prime is 168920177999. The next prime is 168920178013. The reversal of 168920178001 is 100871029861.

It is a happy number.

The square root of 168920178001 is 410999.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 168920178001 - 2¹ = 168920177999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168920178901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 205500 + ... + 616498.

Almost surely, 2^168920178001 is an apocalyptic number.

168920178001 is the 410999-th square number.

168920178001 is the 205500-th centered octagonal number.

It is an amenable number.

168920178001 is a deficient number, since it is larger than the sum of its proper divisors (411000).

168920178001 is an frugal number, since it uses more digits than its factorization.

168920178001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821998 (or 410999 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 43.

It can be divided in two parts, 168920 and 178001, that added together give a square (346921 = 589²).

The spelling of 168920178001 in words is "one hundred sixty-eight billion, nine hundred twenty million, one hundred seventy-eight thousand, one".