26166985728 has 88 divisors (see below), whose sum is σ = 75109637568. Its totient is φ = 8051367936.

The previous prime is 26166985727. The next prime is 26166985739. The reversal of 26166985728 is 82758966162.

It is a super-2 number, since 2×26166985728² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26166985721) 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, 287676 + ... + 367547.

Almost surely, 2^26166985728 is an apocalyptic number.

It is an amenable number.

26166985728 is an abundant number, since it is smaller than the sum of its proper divisors (48942651840).

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

26166985728 is a wasteful number, since it uses less digits than its factorization.

26166985728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655259 (or 655241 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 60.

The spelling of 26166985728 in words is "twenty-six billion, one hundred sixty-six million, nine hundred eighty-five thousand, seven hundred twenty-eight".