26251265012640 has 96 divisors (see below), whose sum is σ = 82693935918720. Its totient is φ = 7000129833984.

The previous prime is 26251265012633. The next prime is 26251265012647. The reversal of 26251265012640 is 4621056215262.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (26251265012633) and next prime (26251265012647).

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 26251265012592 and 26251265012601.

It is not an unprimeable number, because it can be changed into a prime (26251265012647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15751797 + ... + 17338443.

It is an arithmetic number, because the mean of its divisors is an integer number (861395165820).

Almost surely, 2^{26251265012640} is an apocalyptic number.

26251265012640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26251265012640 is an abundant number, since it is smaller than the sum of its proper divisors (56442670906080).

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

26251265012640 is a wasteful number, since it uses less digits than its factorization.

26251265012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621134 (or 1621126 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 26251265012640 in words is "twenty-six trillion, two hundred fifty-one billion, two hundred sixty-five million, twelve thousand, six hundred forty".