26218148981 has 8 divisors (see below), whose sum is σ = 26673423000. Its totient is φ = 25763696640.

The previous prime is 26218148959. The next prime is 26218149007. The reversal of 26218148981 is 18984181262.

It can be written as a sum of positive squares in 4 ways, for example, as 3344308900 + 22873840081 = 57830^2 + 151241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26218148981 - 2¹⁴ = 26218132597 is a prime.

It is a super-2 number, since 2×26218148981² (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 (26218148911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140876 + ... + 268853.

It is an arithmetic number, because the mean of its divisors is an integer number (3334177875).

Almost surely, 2^26218148981 is an apocalyptic number.

It is an amenable number.

26218148981 is a deficient number, since it is larger than the sum of its proper divisors (455274019).

26218148981 is a wasteful number, since it uses less digits than its factorization.

26218148981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410839.

The product of its digits is 442368, while the sum is 50.

The spelling of 26218148981 in words is "twenty-six billion, two hundred eighteen million, one hundred forty-eight thousand, nine hundred eighty-one".