168022973381 has 4 divisors (see below), whose sum is σ = 168271161612. Its totient is φ = 167774785152.

The previous prime is 168022973273. The next prime is 168022973449. The reversal of 168022973381 is 183379220861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183379220861 = 29 ⋅6323421409.

It can be written as a sum of positive squares in 2 ways, for example, as 84756676900 + 83266296481 = 291130^2 + 288559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168022973381 is a prime.

It is a super-2 number, since 2×168022973381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168022973981) 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, 124093100 + ... + 124094453.

It is an arithmetic number, because the mean of its divisors is an integer number (42067790403).

Almost surely, 2^168022973381 is an apocalyptic number.

It is an amenable number.

168022973381 is a deficient number, since it is larger than the sum of its proper divisors (248188231).

168022973381 is an equidigital number, since it uses as much as digits as its factorization.

168022973381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248188230.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 168022973381 in words is "one hundred sixty-eight billion, twenty-two million, nine hundred seventy-three thousand, three hundred eighty-one".