26440662481 has 2 divisors, whose sum is σ = 26440662482. Its totient is φ = 26440662480.

The previous prime is 26440662467. The next prime is 26440662509. The reversal of 26440662481 is 18426604462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22548025600 + 3892636881 = 150160^2 + 62391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26440662481 is a prime.

It is a super-2 number, since 2×26440662481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26440662401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13220331240 + 13220331241.

It is an arithmetic number, because the mean of its divisors is an integer number (13220331241).

Almost surely, 2^26440662481 is an apocalyptic number.

It is an amenable number.

26440662481 is a deficient number, since it is larger than the sum of its proper divisors (1).

26440662481 is an equidigital number, since it uses as much as digits as its factorization.

26440662481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 43.

The spelling of 26440662481 in words is "twenty-six billion, four hundred forty million, six hundred sixty-two thousand, four hundred eighty-one".