1345256331663 has 4 divisors (see below), whose sum is σ = 1793675108888. Its totient is φ = 896837554440.

The previous prime is 1345256331589. The next prime is 1345256331673. The reversal of 1345256331663 is 3661336525431.

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

It is not a de Polignac number, because 1345256331663 - 2⁸ = 1345256331407 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 (1345256331673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224209388608 + ... + 224209388613.

It is an arithmetic number, because the mean of its divisors is an integer number (448418777222).

Almost surely, 2^{1345256331663} is an apocalyptic number.

1345256331663 is a deficient number, since it is larger than the sum of its proper divisors (448418777225).

1345256331663 is an equidigital number, since it uses as much as digits as its factorization.

1345256331663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448418777224.

The product of its digits is 3499200, while the sum is 48.

The spelling of 1345256331663 in words is "one trillion, three hundred forty-five billion, two hundred fifty-six million, three hundred thirty-one thousand, six hundred sixty-three".