26418352981 has 4 divisors (see below), whose sum is σ = 27329330700. Its totient is φ = 25507375264.

The previous prime is 26418352973. The next prime is 26418352991. The reversal of 26418352981 is 18925381462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11285662756 + 15132690225 = 106234^2 + 123015^2 .

It is a cyclic number.

It is not a de Polignac number, because 26418352981 - 2³ = 26418352973 is a prime.

It is a super-2 number, since 2×26418352981² (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 (26418352991) 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, 455488816 + ... + 455488873.

It is an arithmetic number, because the mean of its divisors is an integer number (6832332675).

Almost surely, 2^26418352981 is an apocalyptic number.

It is an amenable number.

26418352981 is a deficient number, since it is larger than the sum of its proper divisors (910977719).

26418352981 is an equidigital number, since it uses as much as digits as its factorization.

26418352981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910977718.

The product of its digits is 829440, while the sum is 49.

The spelling of 26418352981 in words is "twenty-six billion, four hundred eighteen million, three hundred fifty-two thousand, nine hundred eighty-one".