165420326351 has 4 divisors (see below), whose sum is σ = 189051801552. Its totient is φ = 141788851152.

The previous prime is 165420326287. The next prime is 165420326359. The reversal of 165420326351 is 153623024561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153623024561 = 17713 ⋅8672897.

It is a cyclic number.

It is not a de Polignac number, because 165420326351 - 2⁶ = 165420326287 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 (165420326359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11815737590 + ... + 11815737603.

It is an arithmetic number, because the mean of its divisors is an integer number (47262950388).

Almost surely, 2^165420326351 is an apocalyptic number.

165420326351 is a deficient number, since it is larger than the sum of its proper divisors (23631475201).

165420326351 is an equidigital number, since it uses as much as digits as its factorization.

165420326351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23631475200.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 165420326351 in words is "one hundred sixty-five billion, four hundred twenty million, three hundred twenty-six thousand, three hundred fifty-one".