20010081668625 has 64 divisors (see below), whose sum is σ = 37244716704000. Its totient is φ = 10600418836800.

The previous prime is 20010081668623. The next prime is 20010081668641. The reversal of 20010081668625 is 52686618001002.

20010081668625 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 0 + 0 + 8 + 16 + 6 + 8 + 625 = 666.

It is not a de Polignac number, because 20010081668625 - 2¹ = 20010081668623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20010081668623) 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 63 ways as a sum of consecutive naturals, for example, 19392807 + ... + 20398556.

It is an arithmetic number, because the mean of its divisors is an integer number (581948698500).

Almost surely, 2^{20010081668625} is an apocalyptic number.

20010081668625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20010081668625 is a deficient number, since it is larger than the sum of its proper divisors (17234635035375).

20010081668625 is a wasteful number, since it uses less digits than its factorization.

20010081668625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39791536 (or 39791520 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

Adding to 20010081668625 its reverse (52686618001002), we get a palindrome (72696699669627).

The spelling of 20010081668625 in words is "twenty trillion, ten billion, eighty-one million, six hundred sixty-eight thousand, six hundred twenty-five".