42120162225 has 18 divisors (see below), whose sum is σ = 75441890966. Its totient is φ = 22464086400.

The previous prime is 42120162221. The next prime is 42120162233. The reversal of 42120162225 is 52226102124.

42120162225 is a `hidden beast` number, since 4 + 2 + 12 + 0 + 1 + 622 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 322813089 + 41797349136 = 17967^2 + 204444^2 .

It is not a de Polignac number, because 42120162225 - 2² = 42120162221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120162221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 93600136 + ... + 93600585.

Almost surely, 2^42120162225 is an apocalyptic number.

42120162225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42120162225 is a deficient number, since it is larger than the sum of its proper divisors (33321728741).

42120162225 is a wasteful number, since it uses less digits than its factorization.

42120162225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187200737 (or 187200729 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 42120162225 its reverse (52226102124), we get a palindrome (94346264349).

The spelling of 42120162225 in words is "forty-two billion, one hundred twenty million, one hundred sixty-two thousand, two hundred twenty-five".