26651634240 has 672 divisors, whose sum is σ = 107994297600. Its totient is φ = 5449973760.

The previous prime is 26651634223. The next prime is 26651634253. The reversal of 26651634240 is 4243615662.

It is a tau number, because it is divible by the number of its divisors (672).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 59357536 + ... + 59357984.

It is an arithmetic number, because the mean of its divisors is an integer number (160705800).

Almost surely, 2^26651634240 is an apocalyptic number.

26651634240 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 26651634240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53997148800).

26651634240 is an abundant number, since it is smaller than the sum of its proper divisors (81342663360).

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

26651634240 is a wasteful number, since it uses less digits than its factorization.

26651634240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 26651634240 in words is "twenty-six billion, six hundred fifty-one million, six hundred thirty-four thousand, two hundred forty".