26897135616 has 768 divisors, whose sum is σ = 95103590400. Its totient is φ = 7431782400.

The previous prime is 26897135597. The next prime is 26897135627. The reversal of 26897135616 is 61653179862.

26897135616 is a `hidden beast` number, since 2 + 6 + 8 + 9 + 7 + 13 + 5 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 378832861 + ... + 378832931.

It is an arithmetic number, because the mean of its divisors is an integer number (123832800).

Almost surely, 2^26897135616 is an apocalyptic number.

26897135616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26897135616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47551795200).

26897135616 is an abundant number, since it is smaller than the sum of its proper divisors (68206454784).

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

26897135616 is a wasteful number, since it uses less digits than its factorization.

26897135616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 137 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 26897135616 in words is "twenty-six billion, eight hundred ninety-seven million, one hundred thirty-five thousand, six hundred sixteen".