168444023445 has 20 divisors (see below), whose sum is σ = 301951509420. Its totient is φ = 89836812288.

The previous prime is 168444023443. The next prime is 168444023563. The reversal of 168444023445 is 544320444861.

It is a happy number.

168444023445 is a `hidden beast` number, since 168 + 4 + 4 + 40 + 2 + 3 + 445 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 88219692324 + 80224331121 = 297018^2 + 283239^2 .

It is not a de Polignac number, because 168444023445 - 2¹ = 168444023443 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 168444023445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168444023441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 207955180 + ... + 207955989.

It is an arithmetic number, because the mean of its divisors is an integer number (15097575471).

Almost surely, 2^168444023445 is an apocalyptic number.

168444023445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168444023445 is a deficient number, since it is larger than the sum of its proper divisors (133507485975).

168444023445 is an equidigital number, since it uses as much as digits as its factorization.

168444023445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415911186 (or 415911177 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 45.

The spelling of 168444023445 in words is "one hundred sixty-eight billion, four hundred forty-four million, twenty-three thousand, four hundred forty-five".