26571889491 has 24 divisors (see below), whose sum is σ = 43637873040. Its totient is φ = 14290762752.

The previous prime is 26571889483. The next prime is 26571889493. The reversal of 26571889491 is 19498817562.

It is not a de Polignac number, because 26571889491 - 2³ = 26571889483 is a prime.

It is a super-2 number, since 2×26571889491² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26571889493) 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, 5314006 + ... + 5319003.

It is an arithmetic number, because the mean of its divisors is an integer number (1818244710).

Almost surely, 2^26571889491 is an apocalyptic number.

26571889491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

26571889491 is a deficient number, since it is larger than the sum of its proper divisors (17065983549).

26571889491 is a wasteful number, since it uses less digits than its factorization.

26571889491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10633043 (or 10633036 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 60.

The spelling of 26571889491 in words is "twenty-six billion, five hundred seventy-one million, eight hundred eighty-nine thousand, four hundred ninety-one".