26687456381 has 4 divisors (see below), whose sum is σ = 26702682012. Its totient is φ = 26672230752.

The previous prime is 26687456363. The next prime is 26687456401. The reversal of 26687456381 is 18365478662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10897272100 + 15790184281 = 104390^2 + 125659^2 .

It is a cyclic number.

It is not a de Polignac number, because 26687456381 - 2²² = 26683262077 is a prime.

It is a super-2 number, since 2×26687456381² (a number of 22 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 (26687456321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7610186 + ... + 7613691.

It is an arithmetic number, because the mean of its divisors is an integer number (6675670503).

Almost surely, 2^26687456381 is an apocalyptic number.

It is an amenable number.

26687456381 is a deficient number, since it is larger than the sum of its proper divisors (15225631).

26687456381 is a wasteful number, since it uses less digits than its factorization.

26687456381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15225630.

The product of its digits is 11612160, while the sum is 56.

The spelling of 26687456381 in words is "twenty-six billion, six hundred eighty-seven million, four hundred fifty-six thousand, three hundred eighty-one".