26217556881720 has 64 divisors (see below), whose sum is σ = 78790900500000. Its totient is φ = 6979061403648.

The previous prime is 26217556881709. The next prime is 26217556881731. The reversal of 26217556881720 is 2718865571262.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (26217556881709) and next prime (26217556881731).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

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, 191917345 + ... + 192053904.

Almost surely, 2^{26217556881720} is an apocalyptic number.

26217556881720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26217556881720 is an abundant number, since it is smaller than the sum of its proper divisors (52573343618280).

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

26217556881720 is a wasteful number, since it uses less digits than its factorization.

26217556881720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383971832 (or 383971828 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 60.

The spelling of 26217556881720 in words is "twenty-six trillion, two hundred seventeen billion, five hundred fifty-six million, eight hundred eighty-one thousand, seven hundred twenty".