169401555523 has 2 divisors, whose sum is σ = 169401555524. Its totient is φ = 169401555522.

The previous prime is 169401555509. The next prime is 169401555607. The reversal of 169401555523 is 325555104961.

169401555523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (325555104961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169401555523 is a prime.

It is a super-2 number, since 2×169401555523² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (169401558523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84700777761 + 84700777762.

It is an arithmetic number, because the mean of its divisors is an integer number (84700777762).

Almost surely, 2^169401555523 is an apocalyptic number.

169401555523 is a deficient number, since it is larger than the sum of its proper divisors (1).

169401555523 is an equidigital number, since it uses as much as digits as its factorization.

169401555523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 169401555523 in words is "one hundred sixty-nine billion, four hundred one million, five hundred fifty-five thousand, five hundred twenty-three".