26561396131860 has 96 divisors (see below), whose sum is σ = 81286944463872. Its totient is φ = 6451344783360.

The previous prime is 26561396131849. The next prime is 26561396131871. The reversal of 26561396131860 is 6813169316562.

It is an interprime number because it is at equal distance from previous prime (26561396131849) and next prime (26561396131871).

It is a self number, because there is not a number n which added to its sum of digits gives 26561396131860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419977807 + ... + 420041046.

It is an arithmetic number, because the mean of its divisors is an integer number (846739004832).

Almost surely, 2^{26561396131860} is an apocalyptic number.

26561396131860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26561396131860 is an abundant number, since it is smaller than the sum of its proper divisors (54725548332012).

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

26561396131860 is a wasteful number, since it uses less digits than its factorization.

26561396131860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840018913 (or 840018911 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 26561396131860 in words is "twenty-six trillion, five hundred sixty-one billion, three hundred ninety-six million, one hundred thirty-one thousand, eight hundred sixty".