165647165280541 has 16 divisors (see below), whose sum is σ = 196889261776768. Its totient is φ = 136407882945600.

The previous prime is 165647165280539. The next prime is 165647165280557. The reversal of 165647165280541 is 145082561746561.

It is not a de Polignac number, because 165647165280541 - 2¹ = 165647165280539 is a prime.

It is a super-2 number, since 2×165647165280541² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165647165280541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165647165280521) 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, 4510824330 + ... + 4510861051.

It is an arithmetic number, because the mean of its divisors is an integer number (12305578861048).

Almost surely, 2^{165647165280541} is an apocalyptic number.

It is an amenable number.

165647165280541 is a deficient number, since it is larger than the sum of its proper divisors (31242096496227).

165647165280541 is an equidigital number, since it uses as much as digits as its factorization.

165647165280541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021685492.

The product of its (nonzero) digits is 48384000, while the sum is 61.

The spelling of 165647165280541 in words is "one hundred sixty-five trillion, six hundred forty-seven billion, one hundred sixty-five million, two hundred eighty thousand, five hundred forty-one".