26161621766 has 32 divisors (see below), whose sum is σ = 45905398272. Its totient is φ = 10950851520.

The previous prime is 26161621753. The next prime is 26161621879. The reversal of 26161621766 is 66712616162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16631 + ... + 229346.

It is an arithmetic number, because the mean of its divisors is an integer number (1434543696).

Almost surely, 2^26161621766 is an apocalyptic number.

26161621766 is a deficient number, since it is larger than the sum of its proper divisors (19743776506).

26161621766 is a wasteful number, since it uses less digits than its factorization.

26161621766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246164.

The product of its digits is 217728, while the sum is 44.

It can be divided in two parts, 261616 and 21766, that added together give a palindrome (283382).

The spelling of 26161621766 in words is "twenty-six billion, one hundred sixty-one million, six hundred twenty-one thousand, seven hundred sixty-six".