538168021001 has 4 divisors (see below), whose sum is σ = 579565561092. Its totient is φ = 496770480912.

The previous prime is 538168020991. The next prime is 538168021009. The reversal of 538168021001 is 100120861835.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103655022025 + 434512998976 = 321955^2 + 659176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538168021001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (538168021009) 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, 20698770026 + ... + 20698770051.

It is an arithmetic number, because the mean of its divisors is an integer number (144891390273).

Almost surely, 2^538168021001 is an apocalyptic number.

It is an amenable number.

538168021001 is a deficient number, since it is larger than the sum of its proper divisors (41397540091).

538168021001 is a wasteful number, since it uses less digits than its factorization.

538168021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41397540090.

The product of its (nonzero) digits is 11520, while the sum is 35.

Adding to 538168021001 its reverse (100120861835), we get a palindrome (638288882836).

The spelling of 538168021001 in words is "five hundred thirty-eight billion, one hundred sixty-eight million, twenty-one thousand, one".