26660815272 has 192 divisors, whose sum is σ = 90197278080. Its totient is φ = 6926363136.

The previous prime is 26660815211. The next prime is 26660815277. The reversal of 26660815272 is 27251806662.

It is a super-4 number, since 4×26660815272⁴ (a number of 43 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (26660815277) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 408618 + ... + 469350.

It is an arithmetic number, because the mean of its divisors is an integer number (469777490).

Almost surely, 2^26660815272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26660815272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45098639040).

26660815272 is an abundant number, since it is smaller than the sum of its proper divisors (63536462808).

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

26660815272 is a wasteful number, since it uses less digits than its factorization.

26660815272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60832 (or 60825 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 26660815272 in words is "twenty-six billion, six hundred sixty million, eight hundred fifteen thousand, two hundred seventy-two".