1356665426 has 4 divisors (see below), whose sum is σ = 2034998142. Its totient is φ = 678332712.

The previous prime is 1356665423. The next prime is 1356665459. The reversal of 1356665426 is 6245666531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6245666531 = 13 ⋅480435887.

It can be written as a sum of positive squares in only one way, i.e., 694375201 + 662290225 = 26351^2 + 25735^2 .

It is a super-2 number, since 2×1356665426² = 3681082156207522952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1356665423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339166355 + ... + 339166358.

Almost surely, 2^1356665426 is an apocalyptic number.

1356665426 is a deficient number, since it is larger than the sum of its proper divisors (678332716).

1356665426 is an equidigital number, since it uses as much as digits as its factorization.

1356665426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678332715.

The product of its digits is 777600, while the sum is 44.

The square root of 1356665426 is about 36832.9394156915. The cubic root of 1356665426 is about 1107.0254004471.

The spelling of 1356665426 in words is "one billion, three hundred fifty-six million, six hundred sixty-five thousand, four hundred twenty-six".