165471784801 has 2 divisors, whose sum is σ = 165471784802. Its totient is φ = 165471784800.

The previous prime is 165471784799. The next prime is 165471784813. The reversal of 165471784801 is 108487174561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115273830400 + 50197954401 = 339520^2 + 224049^2 .

It is an emirp because it is prime and its reverse (108487174561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165471784801 - 2¹ = 165471784799 is a prime.

Together with 165471784799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165471784201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82735892400 + 82735892401.

It is an arithmetic number, because the mean of its divisors is an integer number (82735892401).

Almost surely, 2^165471784801 is an apocalyptic number.

It is an amenable number.

165471784801 is a deficient number, since it is larger than the sum of its proper divisors (1).

165471784801 is an equidigital number, since it uses as much as digits as its factorization.

165471784801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1505280, while the sum is 52.

The spelling of 165471784801 in words is "one hundred sixty-five billion, four hundred seventy-one million, seven hundred eighty-four thousand, eight hundred one".