20500666357 has 2 divisors, whose sum is σ = 20500666358. Its totient is φ = 20500666356.

The previous prime is 20500666321. The next prime is 20500666363. The reversal of 20500666357 is 75366600502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10958111761 + 9542554596 = 104681^2 + 97686^2 .

It is a cyclic number.

It is not a de Polignac number, because 20500666357 - 2⁷ = 20500666229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500666397) 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 as a sum of consecutive naturals, namely, 10250333178 + 10250333179.

It is an arithmetic number, because the mean of its divisors is an integer number (10250333179).

Almost surely, 2^20500666357 is an apocalyptic number.

It is an amenable number.

20500666357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500666357 is an equidigital number, since it uses as much as digits as its factorization.

20500666357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 20500666357 in words is "twenty billion, five hundred million, six hundred sixty-six thousand, three hundred fifty-seven".