26539920159481 has 9 divisors (see below), whose sum is σ = 27203239957519. Its totient is φ = 25892398966000.

The previous prime is 26539920159461. The next prime is 26539920159551. The reversal of 26539920159481 is 18495102993562.

The square root of 26539920159481 is 5151691.

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., 1278842077881 + 25261078081600 = 1130859^2 + 5026040^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26539920159481 is a prime.

It is a super-2 number, since 2×26539920159481² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26539920159461) 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, 211156506 + ... + 211282156.

Almost surely, 2^{26539920159481} is an apocalyptic number.

26539920159481 is the 5151691-st square number.

26539920159481 is the 2575846-th centered octagonal number.

It is an amenable number.

26539920159481 is a deficient number, since it is larger than the sum of its proper divisors (663319798038).

26539920159481 is an frugal number, since it uses more digits than its factorization.

26539920159481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251384 (or 125692 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 64.

The spelling of 26539920159481 in words is "twenty-six trillion, five hundred thirty-nine billion, nine hundred twenty million, one hundred fifty-nine thousand, four hundred eighty-one".