26957921536 has 108 divisors (see below), whose sum is σ = 67411412292. Its totient is φ = 10664607744.

The previous prime is 26957921491. The next prime is 26957921539. The reversal of 26957921536 is 63512975962.

It can be written as a sum of positive squares in 2 ways, for example, as 1054950400 + 25902971136 = 32480^2 + 160944^2 .

It is a super-2 number, since 2×26957921536² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26957921539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80416 + ... + 245728.

Almost surely, 2^26957921536 is an apocalyptic number.

26957921536 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 26957921536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33705706146).

26957921536 is an abundant number, since it is smaller than the sum of its proper divisors (40453490756).

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

26957921536 is a wasteful number, since it uses less digits than its factorization.

26957921536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165356 (or 165335 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 55.

The spelling of 26957921536 in words is "twenty-six billion, nine hundred fifty-seven million, nine hundred twenty-one thousand, five hundred thirty-six".