165424525501 has 4 divisors (see below), whose sum is σ = 165441862432. Its totient is φ = 165407188572.

The previous prime is 165424525471. The next prime is 165424525517. The reversal of 165424525501 is 105525424561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 105525424561 = 24181 ⋅4363981.

It is a cyclic number.

It is not a de Polignac number, because 165424525501 - 2²¹ = 165422428349 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 (165424525561) 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 3 ways as a sum of consecutive naturals, for example, 8654145 + ... + 8673238.

It is an arithmetic number, because the mean of its divisors is an integer number (41360465608).

Almost surely, 2^165424525501 is an apocalyptic number.

It is an amenable number.

165424525501 is a deficient number, since it is larger than the sum of its proper divisors (17336931).

165424525501 is an equidigital number, since it uses as much as digits as its factorization.

165424525501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17336930.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 165424525501 in words is "one hundred sixty-five billion, four hundred twenty-four million, five hundred twenty-five thousand, five hundred one".