20261256876767 has 4 divisors (see below), whose sum is σ = 20261292657840. Its totient is φ = 20261221095696.

The previous prime is 20261256876743. The next prime is 20261256876769. The reversal of 20261256876767 is 76767865216202.

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 20261256876767 - 2²⁸ = 20260988441311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261256876769) 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, 17027267 + ... + 18178292.

It is an arithmetic number, because the mean of its divisors is an integer number (5065323164460).

Almost surely, 2^{20261256876767} is an apocalyptic number.

20261256876767 is a deficient number, since it is larger than the sum of its proper divisors (35781073).

20261256876767 is an equidigital number, since it uses as much as digits as its factorization.

20261256876767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35781072.

The product of its (nonzero) digits is 142248960, while the sum is 65.

The spelling of 20261256876767 in words is "twenty trillion, two hundred sixty-one billion, two hundred fifty-six million, eight hundred seventy-six thousand, seven hundred sixty-seven".