20866736601 has 6 divisors (see below), whose sum is σ = 30140841770. Its totient is φ = 13911157728.

The previous prime is 20866736599. The next prime is 20866736623. The reversal of 20866736601 is 10663766802.

20866736601 is a `hidden beast` number, since 2 + 0 + 8 + 6 + 6 + 7 + 36 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20128799376 + 737937225 = 141876^2 + 27165^2 .

It is not a de Polignac number, because 20866736601 - 2¹ = 20866736599 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20866736641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1159263136 + ... + 1159263153.

Almost surely, 2^20866736601 is an apocalyptic number.

It is an amenable number.

20866736601 is a deficient number, since it is larger than the sum of its proper divisors (9274105169).

20866736601 is a wasteful number, since it uses less digits than its factorization.

20866736601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318526295 (or 2318526292 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 20866736601 in words is "twenty billion, eight hundred sixty-six million, seven hundred thirty-six thousand, six hundred one".