26191621404 has 192 divisors, whose sum is σ = 80797409280. Its totient is φ = 7254973440.

The previous prime is 26191621399. The next prime is 26191621439. The reversal of 26191621404 is 40412619162.

26191621404 is a `hidden beast` number, since 2 + 6 + 191 + 62 + 1 + 404 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 525109 + ... + 572819.

It is an arithmetic number, because the mean of its divisors is an integer number (420819840).

Almost surely, 2^26191621404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26191621404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40398704640).

26191621404 is an abundant number, since it is smaller than the sum of its proper divisors (54605787876).

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

26191621404 is a wasteful number, since it uses less digits than its factorization.

26191621404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47777 (or 47769 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 26191621404 in words is "twenty-six billion, one hundred ninety-one million, six hundred twenty-one thousand, four hundred four".