26429489981 has 4 divisors (see below), whose sum is σ = 26429936832. Its totient is φ = 26429043132.

The previous prime is 26429489971. The next prime is 26429490047. The reversal of 26429489981 is 18998492462.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18998492462 = 2 ⋅9499246231.

It is a cyclic number.

It is not a de Polignac number, because 26429489981 - 2³⁰ = 25355748157 is a prime.

It is a super-2 number, since 2×26429489981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26429489951) 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, 118181 + ... + 258506.

It is an arithmetic number, because the mean of its divisors is an integer number (6607484208).

Almost surely, 2^26429489981 is an apocalyptic number.

It is an amenable number.

26429489981 is a deficient number, since it is larger than the sum of its proper divisors (446851).

26429489981 is an equidigital number, since it uses as much as digits as its factorization.

26429489981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446850.

The product of its digits is 17915904, while the sum is 62.

The spelling of 26429489981 in words is "twenty-six billion, four hundred twenty-nine million, four hundred eighty-nine thousand, nine hundred eighty-one".