20661706001 has 2 divisors, whose sum is σ = 20661706002. Its totient is φ = 20661706000.

The previous prime is 20661705997. The next prime is 20661706027. The reversal of 20661706001 is 10060716602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11359296400 + 9302409601 = 106580^2 + 96449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20661706001 - 2² = 20661705997 is a prime.

It is not a weakly prime, because it can be changed into another prime (20661703001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10330853000 + 10330853001.

It is an arithmetic number, because the mean of its divisors is an integer number (10330853001).

Almost surely, 2^20661706001 is an apocalyptic number.

It is an amenable number.

20661706001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20661706001 is an equidigital number, since it uses as much as digits as its factorization.

20661706001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The spelling of 20661706001 in words is "twenty billion, six hundred sixty-one million, seven hundred six thousand, one".