20466663557077 has 2 divisors, whose sum is σ = 20466663557078. Its totient is φ = 20466663557076.

The previous prime is 20466663557047. The next prime is 20466663557099. The reversal of 20466663557077 is 77075536666402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19725332225041 + 741331332036 = 4441321^2 + 861006^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466663557077 - 2³¹ = 20464516073429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20466663557017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10233331778538 + 10233331778539.

It is an arithmetic number, because the mean of its divisors is an integer number (10233331778539).

Almost surely, 2^{20466663557077} is an apocalyptic number.

It is an amenable number.

20466663557077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466663557077 is an equidigital number, since it uses as much as digits as its factorization.

20466663557077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 266716800, while the sum is 64.

The spelling of 20466663557077 in words is "twenty trillion, four hundred sixty-six billion, six hundred sixty-three million, five hundred fifty-seven thousand, seventy-seven".