26345281640 has 64 divisors (see below), whose sum is σ = 59591635200. Its totient is φ = 10482294528.

The previous prime is 26345281631. The next prime is 26345281661. The reversal of 26345281640 is 4618254362.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7964867 + ... + 7968173.

It is an arithmetic number, because the mean of its divisors is an integer number (931119300).

Almost surely, 2^26345281640 is an apocalyptic number.

26345281640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26345281640 is an abundant number, since it is smaller than the sum of its proper divisors (33246353560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26345281640 is a wasteful number, since it uses less digits than its factorization.

26345281640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314 (or 4310 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 26345281640 in words is "twenty-six billion, three hundred forty-five million, two hundred eighty-one thousand, six hundred forty".