26984563481 has 4 divisors (see below), whose sum is σ = 27915065700. Its totient is φ = 26054061264.

The previous prime is 26984563469. The next prime is 26984563513. The reversal of 26984563481 is 18436548962.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11828737600 + 15155825881 = 108760^2 + 123109^2 .

It is a cyclic number.

It is not a de Polignac number, because 26984563481 - 2¹⁰ = 26984562457 is a prime.

It is a super-2 number, since 2×26984563481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26984563451) 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, 465251066 + ... + 465251123.

It is an arithmetic number, because the mean of its divisors is an integer number (6978766425).

Almost surely, 2^26984563481 is an apocalyptic number.

It is an amenable number.

26984563481 is a deficient number, since it is larger than the sum of its proper divisors (930502219).

26984563481 is an equidigital number, since it uses as much as digits as its factorization.

26984563481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930502218.

The product of its digits is 9953280, while the sum is 56.

The spelling of 26984563481 in words is "twenty-six billion, nine hundred eighty-four million, five hundred sixty-three thousand, four hundred eighty-one".