1340566641 has 18 divisors (see below), whose sum is σ = 2043657330. Its totient is φ = 846671616.

The previous prime is 1340566609. The next prime is 1340566649. The reversal of 1340566641 is 1466650431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1281353616 + 59213025 = 35796^2 + 7695^2 .

It is not a de Polignac number, because 1340566641 - 2⁵ = 1340566609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340566596 and 1340566605.

It is not an unprimeable number, because it can be changed into a prime (1340566649) 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 in 17 ways as a sum of consecutive naturals, for example, 203056 + ... + 209553.

Almost surely, 2^1340566641 is an apocalyptic number.

It is an amenable number.

1340566641 is a deficient number, since it is larger than the sum of its proper divisors (703090689).

1340566641 is a wasteful number, since it uses less digits than its factorization.

1340566641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412653 (or 412631 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1340566641 is about 36613.7493436550. The cubic root of 1340566641 is about 1102.6291492620.

The spelling of 1340566641 in words is "one billion, three hundred forty million, five hundred sixty-six thousand, six hundred forty-one".