20261353755163 has 4 divisors (see below), whose sum is σ = 21453198093720. Its totient is φ = 19069509416608.

The previous prime is 20261353755119. The next prime is 20261353755169. The reversal of 20261353755163 is 36155735316202.

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

It is a cyclic number.

It is not a de Polignac number, because 20261353755163 - 2²⁹ = 20260816884251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261353755169) 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 in 3 ways as a sum of consecutive naturals, for example, 595922169253 + ... + 595922169286.

It is an arithmetic number, because the mean of its divisors is an integer number (5363299523430).

Almost surely, 2^{20261353755163} is an apocalyptic number.

20261353755163 is a deficient number, since it is larger than the sum of its proper divisors (1191844338557).

20261353755163 is a wasteful number, since it uses less digits than its factorization.

20261353755163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191844338556.

The product of its (nonzero) digits is 3402000, while the sum is 49.

The spelling of 20261353755163 in words is "twenty trillion, two hundred sixty-one billion, three hundred fifty-three million, seven hundred fifty-five thousand, one hundred sixty-three".