26118988621 has 4 divisors (see below), whose sum is σ = 28493442144. Its totient is φ = 23744535100.

The previous prime is 26118988583. The next prime is 26118988633. The reversal of 26118988621 is 12688981162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-26118988621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26118088621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187226745 + ... + 1187226766.

It is an arithmetic number, because the mean of its divisors is an integer number (7123360536).

Almost surely, 2^26118988621 is an apocalyptic number.

It is an amenable number.

26118988621 is a deficient number, since it is larger than the sum of its proper divisors (2374453523).

26118988621 is a wasteful number, since it uses less digits than its factorization.

26118988621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374453522.

The product of its digits is 663552, while the sum is 52.

The spelling of 26118988621 in words is "twenty-six billion, one hundred eighteen million, nine hundred eighty-eight thousand, six hundred twenty-one".