165147775425 has 144 divisors (see below), whose sum is σ = 326262867840. Its totient is φ = 82523888640.

The previous prime is 165147775423. The next prime is 165147775447. The reversal of 165147775425 is 524577741561.

165147775425 is a `hidden beast` number, since 1 + 6 + 5 + 147 + 7 + 75 + 425 = 666.

It is not a de Polignac number, because 165147775425 - 2¹ = 165147775423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165147775423) by changing a digit.

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 143 ways as a sum of consecutive naturals, for example, 23646484 + ... + 23653466.

It is an arithmetic number, because the mean of its divisors is an integer number (2265714360).

Almost surely, 2^165147775425 is an apocalyptic number.

165147775425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165147775425 is a deficient number, since it is larger than the sum of its proper divisors (161115092415).

165147775425 is a wasteful number, since it uses less digits than its factorization.

165147775425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7254 (or 7237 counting only the distinct ones).

The product of its digits is 8232000, while the sum is 54.

The spelling of 165147775425 in words is "one hundred sixty-five billion, one hundred forty-seven million, seven hundred seventy-five thousand, four hundred twenty-five".