20663061262563 has 4 divisors (see below), whose sum is σ = 27550748350088. Its totient is φ = 13775374175040.

The previous prime is 20663061262561. The next prime is 20663061262633. The reversal of 20663061262563 is 36526216036602.

It is a happy number.

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

It is not a de Polignac number, because 20663061262563 - 2¹ = 20663061262561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20663061262561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443843543758 + ... + 3443843543763.

It is an arithmetic number, because the mean of its divisors is an integer number (6887687087522).

Almost surely, 2^{20663061262563} is an apocalyptic number.

20663061262563 is a deficient number, since it is larger than the sum of its proper divisors (6887687087525).

20663061262563 is an equidigital number, since it uses as much as digits as its factorization.

20663061262563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887687087524.

The product of its (nonzero) digits is 2799360, while the sum is 48.

The spelling of 20663061262563 in words is "twenty trillion, six hundred sixty-three billion, sixty-one million, two hundred sixty-two thousand, five hundred sixty-three".