161207142225 has 24 divisors (see below), whose sum is σ = 266932444992. Its totient is φ = 85847044800.

The previous prime is 161207142181. The next prime is 161207142293. The reversal of 161207142225 is 522241702161.

It is not a de Polignac number, because 161207142225 - 2⁹ = 161207141713 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1576317 + ... + 1675466.

It is an arithmetic number, because the mean of its divisors is an integer number (11122185208).

Almost surely, 2^161207142225 is an apocalyptic number.

161207142225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161207142225 is a deficient number, since it is larger than the sum of its proper divisors (105725302767).

161207142225 is a wasteful number, since it uses less digits than its factorization.

161207142225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252457 (or 3252452 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 161207142225 its reverse (522241702161), we get a palindrome (683448844386).

The spelling of 161207142225 in words is "one hundred sixty-one billion, two hundred seven million, one hundred forty-two thousand, two hundred twenty-five".