26521489387 has 4 divisors (see below), whose sum is σ = 28081577016. Its totient is φ = 24961401760.

The previous prime is 26521489367. The next prime is 26521489391. The reversal of 26521489387 is 78398412562.

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

It is a cyclic number.

It is not a de Polignac number, because 26521489387 - 2³¹ = 24374005739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26521489307) 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, 780043789 + ... + 780043822.

It is an arithmetic number, because the mean of its divisors is an integer number (7020394254).

Almost surely, 2^26521489387 is an apocalyptic number.

26521489387 is a deficient number, since it is larger than the sum of its proper divisors (1560087629).

26521489387 is a wasteful number, since it uses less digits than its factorization.

26521489387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560087628.

The product of its digits is 5806080, while the sum is 55.

The spelling of 26521489387 in words is "twenty-six billion, five hundred twenty-one million, four hundred eighty-nine thousand, three hundred eighty-seven".