20126265656803 has 2 divisors, whose sum is σ = 20126265656804. Its totient is φ = 20126265656802.

The previous prime is 20126265656747. The next prime is 20126265656839. The reversal of 20126265656803 is 30865656262102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20126265656803 - 2⁴¹ = 17927242401251 is a prime.

It is not a weakly prime, because it can be changed into another prime (20126265656863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063132828401 + 10063132828402.

It is an arithmetic number, because the mean of its divisors is an integer number (10063132828402).

Almost surely, 2^{20126265656803} is an apocalyptic number.

20126265656803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126265656803 is an equidigital number, since it uses as much as digits as its factorization.

20126265656803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 52.

The spelling of 20126265656803 in words is "twenty trillion, one hundred twenty-six billion, two hundred sixty-five million, six hundred fifty-six thousand, eight hundred three".