1345656440393 has 4 divisors (see below), whose sum is σ = 1358979771588. Its totient is φ = 1332333109200.

The previous prime is 1345656440357. The next prime is 1345656440399. The reversal of 1345656440393 is 3930446565431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1069793038864 + 275863401529 = 1034308^2 + 525227^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345656440393 - 2⁸ = 1345656440137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1345656440399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6661665446 + ... + 6661665647.

It is an arithmetic number, because the mean of its divisors is an integer number (339744942897).

Almost surely, 2^{1345656440393} is an apocalyptic number.

It is an amenable number.

1345656440393 is a deficient number, since it is larger than the sum of its proper divisors (13323331195).

1345656440393 is a wasteful number, since it uses less digits than its factorization.

1345656440393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323331194.

The product of its (nonzero) digits is 13996800, while the sum is 53.

The spelling of 1345656440393 in words is "one trillion, three hundred forty-five billion, six hundred fifty-six million, four hundred forty thousand, three hundred ninety-three".