26491663180 has 48 divisors (see below), whose sum is σ = 57744610560. Its totient is φ = 10198137600.

The previous prime is 26491663169. The next prime is 26491663199. The reversal of 26491663180 is 8136619462.

It is a self number, because there is not a number n which added to its sum of digits gives 26491663180.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5815 + ... + 230254.

It is an arithmetic number, because the mean of its divisors is an integer number (1203012720).

Almost surely, 2^26491663180 is an apocalyptic number.

26491663180 is a gapful number since it is divisible by the number (20) 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 26491663180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28872305280).

26491663180 is an abundant number, since it is smaller than the sum of its proper divisors (31252947380).

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

26491663180 is a wasteful number, since it uses less digits than its factorization.

26491663180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236290 (or 236288 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 26491663180 in words is "twenty-six billion, four hundred ninety-one million, six hundred sixty-three thousand, one hundred eighty".