26991018541 has 32 divisors (see below), whose sum is σ = 29349561600. Its totient is φ = 24729255936.

The previous prime is 26991018539. The next prime is 26991018559. The reversal of 26991018541 is 14581019962.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 26991018541 - 2¹ = 26991018539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26991018491 and 26991018500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26991018641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43745265 + ... + 43745881.

It is an arithmetic number, because the mean of its divisors is an integer number (917173800).

Almost surely, 2^26991018541 is an apocalyptic number.

It is an amenable number.

26991018541 is a deficient number, since it is larger than the sum of its proper divisors (2358543059).

26991018541 is a wasteful number, since it uses less digits than its factorization.

26991018541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 26991018541 in words is "twenty-six billion, nine hundred ninety-one million, eighteen thousand, five hundred forty-one".