26381651481 has 24 divisors (see below), whose sum is σ = 39683629440. Its totient is φ = 17514140112.

The previous prime is 26381651377. The next prime is 26381651489. The reversal of 26381651481 is 18415618362.

26381651481 is a `hidden beast` number, since 2 + 6 + 3 + 8 + 165 + 1 + 481 = 666.

It is not a de Polignac number, because 26381651481 - 2²⁷ = 26247433753 is a prime.

It is a super-2 number, since 2×26381651481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26381651489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169050 + ... + 285203.

It is an arithmetic number, because the mean of its divisors is an integer number (1653484560).

Almost surely, 2^26381651481 is an apocalyptic number.

It is an amenable number.

26381651481 is a deficient number, since it is larger than the sum of its proper divisors (13301977959).

26381651481 is an equidigital number, since it uses as much as digits as its factorization.

26381651481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454507 (or 454495 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 26381651481 in words is "twenty-six billion, three hundred eighty-one million, six hundred fifty-one thousand, four hundred eighty-one".