26806065085781 has 8 divisors (see below), whose sum is σ = 26962209232824. Its totient is φ = 26649934683840.

The previous prime is 26806065085649. The next prime is 26806065085799. The reversal of 26806065085781 is 18758056060862.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11116662915556 + 15689402170225 = 3334166^2 + 3960985^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26806065085781 - 2²⁶ = 26805997976917 is a prime.

It is a super-2 number, since 2×26806065085781² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26806005085781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488555 + ... + 7338311.

It is an arithmetic number, because the mean of its divisors is an integer number (3370276154103).

Almost surely, 2^{26806065085781} is an apocalyptic number.

It is an amenable number.

26806065085781 is a deficient number, since it is larger than the sum of its proper divisors (156144147043).

26806065085781 is a wasteful number, since it uses less digits than its factorization.

26806065085781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6872551.

The product of its (nonzero) digits is 38707200, while the sum is 62.

The spelling of 26806065085781 in words is "twenty-six trillion, eight hundred six billion, sixty-five million, eighty-five thousand, seven hundred eighty-one".