163989686071431 has 24 divisors (see below), whose sum is σ = 259072278126480. Its totient is φ = 99132193161600.

The previous prime is 163989686071427. The next prime is 163989686071483. The reversal of 163989686071431 is 134170686989361.

163989686071431 is a `hidden beast` number, since 1 + 6 + 3 + 9 + 8 + 9 + 6 + 8 + 607 + 1 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 163989686071431 - 2² = 163989686071427 is a prime.

It is a super-2 number, since 2×163989686071431² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163989686071431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163989686078431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2129089350 + ... + 2129166371.

It is an arithmetic number, because the mean of its divisors is an integer number (10794678255270).

Almost surely, 2^{163989686071431} is an apocalyptic number.

163989686071431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163989686071431 is a deficient number, since it is larger than the sum of its proper divisors (95082592055049).

163989686071431 is a wasteful number, since it uses less digits than its factorization.

163989686071431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4258256127 (or 4258256124 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 72.

The spelling of 163989686071431 in words is "one hundred sixty-three trillion, nine hundred eighty-nine billion, six hundred eighty-six million, seventy-one thousand, four hundred thirty-one".