26129566821 has 16 divisors (see below), whose sum is σ = 36678295040. Its totient is φ = 16500535920.

The previous prime is 26129566819. The next prime is 26129566889. The reversal of 26129566821 is 12866592162.

It is not a de Polignac number, because 26129566821 - 2¹ = 26129566819 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 (26129566891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 428016 + ... + 485238.

It is an arithmetic number, because the mean of its divisors is an integer number (2292393440).

Almost surely, 2^26129566821 is an apocalyptic number.

It is an amenable number.

26129566821 is a deficient number, since it is larger than the sum of its proper divisors (10548728219).

26129566821 is a wasteful number, since it uses less digits than its factorization.

26129566821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65256.

The product of its digits is 622080, while the sum is 48.

The spelling of 26129566821 in words is "twenty-six billion, one hundred twenty-nine million, five hundred sixty-six thousand, eight hundred twenty-one".