26418926521 has 9 divisors (see below), whose sum is σ = 28609764879. Its totient is φ = 24384750936.

The previous prime is 26418926503. The next prime is 26418926531. The reversal of 26418926521 is 12562981462.

The square root of 26418926521 is 162539.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3908125225 + 22510801296 = 62515^2 + 150036^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26418926521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26418926531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2106756 + ... + 2119258.

Almost surely, 2^26418926521 is an apocalyptic number.

26418926521 is the 162539-th square number.

26418926521 is the 81270-th centered octagonal number.

It is an amenable number.

26418926521 is a deficient number, since it is larger than the sum of its proper divisors (2190838358).

26418926521 is an frugal number, since it uses more digits than its factorization.

26418926521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25032 (or 12516 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The spelling of 26418926521 in words is "twenty-six billion, four hundred eighteen million, nine hundred twenty-six thousand, five hundred twenty-one".