1345643653 has 8 divisors (see below), whose sum is σ = 1429356888. Its totient is φ = 1262436864.

The previous prime is 1345643647. The next prime is 1345643693. The reversal of 1345643653 is 3563465431.

It can be written as a sum of positive squares in 4 ways, for example, as 10252804 + 1335390849 = 3202^2 + 36543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1345643653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345643693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121126 + ... + 131767.

It is an arithmetic number, because the mean of its divisors is an integer number (178669611).

Almost surely, 2^1345643653 is an apocalyptic number.

It is an amenable number.

1345643653 is a deficient number, since it is larger than the sum of its proper divisors (83713235).

1345643653 is a wasteful number, since it uses less digits than its factorization.

1345643653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253223.

The product of its digits is 388800, while the sum is 40.

The square root of 1345643653 is about 36683.0158656564. The cubic root of 1345643653 is about 1104.0193597061.

The spelling of 1345643653 in words is "one billion, three hundred forty-five million, six hundred forty-three thousand, six hundred fifty-three".