163986135413 has 4 divisors (see below), whose sum is σ = 163987433868. Its totient is φ = 163984836960.

The previous prime is 163986135373. The next prime is 163986135433. The reversal of 163986135413 is 314531689361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 314531689361 = 109 ⋅2885611829.

It can be written as a sum of positive squares in 2 ways, for example, as 57026395204 + 106959740209 = 238802^2 + 327047^2 .

It is a cyclic number.

It is not a de Polignac number, because 163986135413 - 2⁶ = 163986135349 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 (163986135433) 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, 436568 + ... + 720113.

It is an arithmetic number, because the mean of its divisors is an integer number (40996858467).

Almost surely, 2^163986135413 is an apocalyptic number.

It is an amenable number.

163986135413 is a deficient number, since it is larger than the sum of its proper divisors (1298455).

163986135413 is a wasteful number, since it uses less digits than its factorization.

163986135413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298454.

The product of its digits is 1399680, while the sum is 50.

The spelling of 163986135413 in words is "one hundred sixty-three billion, nine hundred eighty-six million, one hundred thirty-five thousand, four hundred thirteen".