163921436929 has 8 divisors (see below), whose sum is σ = 164082865320. Its totient is φ = 163760088576.

The previous prime is 163921436927. The next prime is 163921436951. The reversal of 163921436929 is 929634129361.

It can be written as a sum of positive squares in 4 ways, for example, as 1995676929 + 161925760000 = 44673^2 + 402400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163921436929 - 2¹ = 163921436927 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 163921436929.

It is not an unprimeable number, because it can be changed into a prime (163921436923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4584529 + ... + 4620145.

It is an arithmetic number, because the mean of its divisors is an integer number (20510358165).

Almost surely, 2^163921436929 is an apocalyptic number.

It is an amenable number.

163921436929 is a deficient number, since it is larger than the sum of its proper divisors (161428391).

163921436929 is a wasteful number, since it uses less digits than its factorization.

163921436929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40019.

The product of its digits is 3779136, while the sum is 55.

The spelling of 163921436929 in words is "one hundred sixty-three billion, nine hundred twenty-one million, four hundred thirty-six thousand, nine hundred twenty-nine".