26217765660 has 24 divisors (see below), whose sum is σ = 73409744016. Its totient is φ = 6991404160.

The previous prime is 26217765611. The next prime is 26217765661. The reversal of 26217765660 is 6656771262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26217765661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218481321 + ... + 218481440.

It is an arithmetic number, because the mean of its divisors is an integer number (3058739334).

Almost surely, 2^26217765660 is an apocalyptic number.

26217765660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26217765660 is an abundant number, since it is smaller than the sum of its proper divisors (47191978356).

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

26217765660 is a wasteful number, since it uses less digits than its factorization.

26217765660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436962773 (or 436962771 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 26217765660 in words is "twenty-six billion, two hundred seventeen million, seven hundred sixty-five thousand, six hundred sixty".