26921666898 has 80 divisors (see below), whose sum is σ = 69160665024. Its totient is φ = 7667537760.

The previous prime is 26921666843. The next prime is 26921666899. The reversal of 26921666898 is 89866612962.

26921666898 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×26921666898² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (26921666899) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 322033 + ... + 396923.

Almost surely, 2^26921666898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26921666898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34580332512).

26921666898 is an abundant number, since it is smaller than the sum of its proper divisors (42238998126).

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

26921666898 is a wasteful number, since it uses less digits than its factorization.

26921666898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75229 (or 75220 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The spelling of 26921666898 in words is "twenty-six billion, nine hundred twenty-one million, six hundred sixty-six thousand, eight hundred ninety-eight".