26346066640 has 20 divisors (see below), whose sum is σ = 61254605124. Its totient is φ = 10538426624.

The previous prime is 26346066629. The next prime is 26346066667. The reversal of 26346066640 is 4666064362.

It can be written as a sum of positive squares in 2 ways, for example, as 8217059904 + 18129006736 = 90648^2 + 134644^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 164662837 + ... + 164662996.

Almost surely, 2^26346066640 is an apocalyptic number.

26346066640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26346066640 is an abundant number, since it is smaller than the sum of its proper divisors (34908538484).

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

26346066640 is a wasteful number, since it uses less digits than its factorization.

26346066640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329325846 (or 329325840 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 26346066640 in words is "twenty-six billion, three hundred forty-six million, sixty-six thousand, six hundred forty".