1340666651 has 2 divisors, whose sum is σ = 1340666652. Its totient is φ = 1340666650.

The previous prime is 1340666633. The next prime is 1340666671. The reversal of 1340666651 is 1566660431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340666651 - 2²⁶ = 1273557787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340666671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670333325 + 670333326.

It is an arithmetic number, because the mean of its divisors is an integer number (670333326).

Almost surely, 2^1340666651 is an apocalyptic number.

1340666651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340666651 is an equidigital number, since it uses as much as digits as its factorization.

1340666651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1340666651 is about 36615.1150619522. The cubic root of 1340666651 is about 1102.6565683139.

The spelling of 1340666651 in words is "one billion, three hundred forty million, six hundred sixty-six thousand, six hundred fifty-one".