26525671991 has 12 divisors (see below), whose sum is σ = 32826361392. Its totient is φ = 20987343936.

The previous prime is 26525671951. The next prime is 26525672021. The reversal of 26525671991 is 19917652562.

It is not a de Polignac number, because 26525671991 - 2²² = 26521477687 is a prime.

It is a super-2 number, since 2×26525671991² (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 (26525671901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11210006 + ... + 11212371.

It is an arithmetic number, because the mean of its divisors is an integer number (2735530116).

Almost surely, 2^26525671991 is an apocalyptic number.

26525671991 is a deficient number, since it is larger than the sum of its proper divisors (6300689401).

26525671991 is a wasteful number, since it uses less digits than its factorization.

26525671991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22422410 (or 22422397 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 53.

The spelling of 26525671991 in words is "twenty-six billion, five hundred twenty-five million, six hundred seventy-one thousand, nine hundred ninety-one".