26549769481 has 9 divisors (see below), whose sum is σ = 26781342861. Its totient is φ = 26320185612.

The previous prime is 26549769479. The next prime is 26549769517. The reversal of 26549769481 is 18496794562.

It is a happy number.

The square root of 26549769481 is 162941.

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

It is not a de Polignac number, because 26549769481 - 2¹ = 26549769479 is a prime.

It is a super-3 number, since 3×26549769481³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26549769781) 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, 20692866 + ... + 20694148.

Almost surely, 2^26549769481 is an apocalyptic number.

26549769481 is the 162941-st square number.

26549769481 is the 81471-st centered octagonal number.

It is an amenable number.

26549769481 is a deficient number, since it is larger than the sum of its proper divisors (231573380).

26549769481 is an frugal number, since it uses more digits than its factorization.

26549769481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820 (or 1410 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 61.

The spelling of 26549769481 in words is "twenty-six billion, five hundred forty-nine million, seven hundred sixty-nine thousand, four hundred eighty-one".