26620859281 has 9 divisors (see below), whose sum is σ = 26808659899. Its totient is φ = 26434368544.

The previous prime is 26620859273. The next prime is 26620859297. The reversal of 26620859281 is 18295802662.

It is a happy number.

The square root of 26620859281 is 163159.

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., 24905574225 + 1715285056 = 157815^2 + 41416^2 .

It is not a de Polignac number, because 26620859281 - 2³ = 26620859273 is a prime.

It is a super-2 number, since 2×26620859281² (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 (26620859081) 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, 27247065 + ... + 27248041.

Almost surely, 2^26620859281 is an apocalyptic number.

26620859281 is the 163159-th square number.

26620859281 is the 81580-th centered octagonal number.

It is an amenable number.

26620859281 is a deficient number, since it is larger than the sum of its proper divisors (187800618).

26620859281 is an frugal number, since it uses more digits than its factorization.

26620859281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

Multiplying 26620859281 by its sum of digits (49), we get a square (1304422104769 = 1142113²).

The spelling of 26620859281 in words is "twenty-six billion, six hundred twenty million, eight hundred fifty-nine thousand, two hundred eighty-one".