163981206947713 has 4 divisors (see below), whose sum is σ = 165604783254228. Its totient is φ = 162357630641200.

The previous prime is 163981206947683. The next prime is 163981206947797. The reversal of 163981206947713 is 317749602189361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147589623930609 + 16391583017104 = 12148647^2 + 4048652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163981206947713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163981206947113) 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, 811788153106 + ... + 811788153307.

It is an arithmetic number, because the mean of its divisors is an integer number (41401195813557).

Almost surely, 2^{163981206947713} is an apocalyptic number.

It is an amenable number.

163981206947713 is a deficient number, since it is larger than the sum of its proper divisors (1623576306515).

163981206947713 is a wasteful number, since it uses less digits than its factorization.

163981206947713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623576306514.

The product of its (nonzero) digits is 82301184, while the sum is 67.

The spelling of 163981206947713 in words is "one hundred sixty-three trillion, nine hundred eighty-one billion, two hundred six million, nine hundred forty-seven thousand, seven hundred thirteen".