26987897451 has 4 divisors (see below), whose sum is σ = 35983863272. Its totient is φ = 17991931632.

The previous prime is 26987897371. The next prime is 26987897471. The reversal of 26987897451 is 15479878962.

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

It is not a de Polignac number, because 26987897451 - 2⁹ = 26987896939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26987897471) 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, 4497982906 + ... + 4497982911.

It is an arithmetic number, because the mean of its divisors is an integer number (8995965818).

Almost surely, 2^26987897451 is an apocalyptic number.

26987897451 is a deficient number, since it is larger than the sum of its proper divisors (8995965821).

26987897451 is an equidigital number, since it uses as much as digits as its factorization.

26987897451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8995965820.

The product of its digits is 60963840, while the sum is 66.

The spelling of 26987897451 in words is "twenty-six billion, nine hundred eighty-seven million, eight hundred ninety-seven thousand, four hundred fifty-one".