20126110100661 has 6 divisors (see below), whose sum is σ = 29071047923190. Its totient is φ = 13417406733768.

The previous prime is 20126110100651. The next prime is 20126110100669. The reversal of 20126110100661 is 16600101162102.

20126110100661 is a `hidden beast` number, since 20 + 12 + 611 + 0 + 10 + 0 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12901249932561 + 7224860168100 = 3591831^2 + 2687910^2 .

It is not a de Polignac number, because 20126110100661 - 2⁷ = 20126110100533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126110100669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1118117227806 + ... + 1118117227823.

It is an arithmetic number, because the mean of its divisors is an integer number (4845174653865).

Almost surely, 2^{20126110100661} is an apocalyptic number.

It is an amenable number.

20126110100661 is a deficient number, since it is larger than the sum of its proper divisors (8944937822529).

20126110100661 is a wasteful number, since it uses less digits than its factorization.

20126110100661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236234455635 (or 2236234455632 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

Adding to 20126110100661 its reverse (16600101162102), we get a palindrome (36726211262763).

The spelling of 20126110100661 in words is "twenty trillion, one hundred twenty-six billion, one hundred ten million, one hundred thousand, six hundred sixty-one".