168236420445 has 40 divisors (see below), whose sum is σ = 301628458296. Its totient is φ = 89711483904.

The previous prime is 168236420431. The next prime is 168236420483. The reversal of 168236420445 is 544024632861.

168236420445 is a `hidden beast` number, since 1 + 6 + 82 + 364 + 204 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8225220249 + 160011200196 = 90693^2 + 400014^2 .

It is not a de Polignac number, because 168236420445 - 2⁵ = 168236420413 is a prime.

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 168236420445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2736969 + ... + 2797761.

Almost surely, 2^168236420445 is an apocalyptic number.

168236420445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168236420445 is a deficient number, since it is larger than the sum of its proper divisors (133392037851).

168236420445 is an equidigital number, since it uses as much as digits as its factorization.

168236420445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67643 (or 67634 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

The spelling of 168236420445 in words is "one hundred sixty-eight billion, two hundred thirty-six million, four hundred twenty thousand, four hundred forty-five".