20161285730128 has 20 divisors (see below), whose sum is σ = 39062882160148. Its totient is φ = 10080541946880.

The previous prime is 20161285730107. The next prime is 20161285730147. The reversal of 20161285730128 is 82103758216102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5168220250384 + 14993065479744 = 2273372^2 + 3872088^2 .

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4645953 + ... + 7868128.

Almost surely, 2^{20161285730128} is an apocalyptic number.

It is an amenable number.

20161285730128 is a deficient number, since it is larger than the sum of its proper divisors (18901596430020).

20161285730128 is a wasteful number, since it uses less digits than its factorization.

20161285730128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12614782 (or 12614776 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 20161285730128 in words is "twenty trillion, one hundred sixty-one billion, two hundred eighty-five million, seven hundred thirty thousand, one hundred twenty-eight".