1345566779 has 4 divisors (see below), whose sum is σ = 1424717784. Its totient is φ = 1266415776.

The previous prime is 1345566767. The next prime is 1345566787. The reversal of 1345566779 is 9776655431.

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

It is a cyclic number.

It is not a de Polignac number, because 1345566779 - 2⁴ = 1345566763 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1345566779.

It is not an unprimeable number, because it can be changed into a prime (1345566709) 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, 39575477 + ... + 39575510.

It is an arithmetic number, because the mean of its divisors is an integer number (356179446).

Almost surely, 2^1345566779 is an apocalyptic number.

1345566779 is a deficient number, since it is larger than the sum of its proper divisors (79151005).

1345566779 is an equidigital number, since it uses as much as digits as its factorization.

1345566779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79151004.

The product of its digits is 4762800, while the sum is 53.

The square root of 1345566779 is about 36681.9680360801. The cubic root of 1345566779 is about 1103.9983358141.

The spelling of 1345566779 in words is "one billion, three hundred forty-five million, five hundred sixty-six thousand, seven hundred seventy-nine".