26656186464 has 144 divisors (see below), whose sum is σ = 78469267968. Its totient is φ = 8576741376.

The previous prime is 26656186463. The next prime is 26656186471. The reversal of 26656186464 is 46468165662.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 26656186464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26656186463) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1343464 + ... + 1363160.

It is an arithmetic number, because the mean of its divisors is an integer number (544925472).

Almost surely, 2^26656186464 is an apocalyptic number.

26656186464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26656186464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39234633984).

26656186464 is an abundant number, since it is smaller than the sum of its proper divisors (51813081504).

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

26656186464 is a wasteful number, since it uses less digits than its factorization.

26656186464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19877 (or 19866 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 26656186464 in words is "twenty-six billion, six hundred fifty-six million, one hundred eighty-six thousand, four hundred sixty-four".