165351426326501 has 4 divisors (see below), whose sum is σ = 165351474825504. Its totient is φ = 165351377827500.

The previous prime is 165351426326473. The next prime is 165351426326521. The reversal of 165351426326501 is 105623624153561.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165351426326501 is a prime.

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 165351426326501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165351426326521) 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, 18714275 + ... + 26094576.

It is an arithmetic number, because the mean of its divisors is an integer number (41337868706376).

Almost surely, 2^{165351426326501} is an apocalyptic number.

It is an amenable number.

165351426326501 is a deficient number, since it is larger than the sum of its proper divisors (48499003).

165351426326501 is an equidigital number, since it uses as much as digits as its factorization.

165351426326501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48499002.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 165351426326501 in words is "one hundred sixty-five trillion, three hundred fifty-one billion, four hundred twenty-six million, three hundred twenty-six thousand, five hundred one".