20466663557057 has 4 divisors (see below), whose sum is σ = 20466722169300. Its totient is φ = 20466604944816.

The previous prime is 20466663557047. The next prime is 20466663557077. The reversal of 20466663557057 is 75075536666402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12579109263616 + 7887554293441 = 3546704^2 + 2808479^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466663557057 - 2²² = 20466659362753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20466663557017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28779182 + ... + 29481767.

It is an arithmetic number, because the mean of its divisors is an integer number (5116680542325).

Almost surely, 2^{20466663557057} is an apocalyptic number.

It is an amenable number.

20466663557057 is a deficient number, since it is larger than the sum of its proper divisors (58612243).

20466663557057 is an equidigital number, since it uses as much as digits as its factorization.

20466663557057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58612242.

The product of its (nonzero) digits is 190512000, while the sum is 62.

The spelling of 20466663557057 in words is "twenty trillion, four hundred sixty-six billion, six hundred sixty-three million, five hundred fifty-seven thousand, fifty-seven".