26991214656 has 224 divisors, whose sum is σ = 87470284800. Its totient is φ = 7176812544.

The previous prime is 26991214603. The next prime is 26991214697. The reversal of 26991214656 is 65641219962.

It is a tau number, because it is divible by the number of its divisors (224).

It is a junction number, because it is equal to n+sod(n) for n = 26991214599 and 26991214608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1131945 + ... + 1155543.

Almost surely, 2^26991214656 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 26991214656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43735142400).

26991214656 is an abundant number, since it is smaller than the sum of its proper divisors (60479070144).

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

26991214656 is a wasteful number, since it uses less digits than its factorization.

26991214656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23681 (or 23671 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 51.

The spelling of 26991214656 in words is "twenty-six billion, nine hundred ninety-one million, two hundred fourteen thousand, six hundred fifty-six".