165220625123501 has 16 divisors (see below), whose sum is σ = 169392454882560. Its totient is φ = 161102306264640.

The previous prime is 165220625123479. The next prime is 165220625123509. The reversal of 165220625123501 is 105321526022561.

It is a cyclic number.

It is not a de Polignac number, because 165220625123501 - 2¹⁰ = 165220625122477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165220625123509) 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, 12379031 + ... + 21992763.

It is an arithmetic number, because the mean of its divisors is an integer number (10587028430160).

Almost surely, 2^{165220625123501} is an apocalyptic number.

It is an amenable number.

165220625123501 is a deficient number, since it is larger than the sum of its proper divisors (4171829759059).

165220625123501 is an equidigital number, since it uses as much as digits as its factorization.

165220625123501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9616516.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 165220625123501 in words is "one hundred sixty-five trillion, two hundred twenty billion, six hundred twenty-five million, one hundred twenty-three thousand, five hundred one".