161425565 has 16 divisors (see below), whose sum is σ = 222983040. Its totient is φ = 109892160.

The previous prime is 161425553. The next prime is 161425567. The reversal of 161425565 is 565524161.

It is not a de Polignac number, because 161425565 - 2⁸ = 161425309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161425567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11726 + ... + 21455.

It is an arithmetic number, because the mean of its divisors is an integer number (13936440).

Almost surely, 2^161425565 is an apocalyptic number.

It is an amenable number.

161425565 is a deficient number, since it is larger than the sum of its proper divisors (61557475).

161425565 is a wasteful number, since it uses less digits than its factorization.

161425565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33332.

The product of its digits is 36000, while the sum is 35.

The square root of 161425565 is about 12705.3360837091. The cubic root of 161425565 is about 544.4910828744.

The spelling of 161425565 in words is "one hundred sixty-one million, four hundred twenty-five thousand, five hundred sixty-five".