26991018542 has 4 divisors (see below), whose sum is σ = 40486527816. Its totient is φ = 13495509270.

The previous prime is 26991018539. The next prime is 26991018559. The reversal of 26991018542 is 24581019962.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6747754634 + ... + 6747754637.

It is an arithmetic number, because the mean of its divisors is an integer number (10121631954).

Almost surely, 2^26991018542 is an apocalyptic number.

26991018542 is a deficient number, since it is larger than the sum of its proper divisors (13495509274).

26991018542 is a wasteful number, since it uses less digits than its factorization.

26991018542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13495509273.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 26991018542 in words is "twenty-six billion, nine hundred ninety-one million, eighteen thousand, five hundred forty-two".