1378665563 has 16 divisors (see below), whose sum is σ = 1571961600. Its totient is φ = 1196875680.

The previous prime is 1378665551. The next prime is 1378665569. The reversal of 1378665563 is 3655668731.

It is a de Polignac number, because none of the positive numbers 2^k-1378665563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378665569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162593 + ... + 170861.

It is an arithmetic number, because the mean of its divisors is an integer number (98247600).

Almost surely, 2^1378665563 is an apocalyptic number.

1378665563 is a deficient number, since it is larger than the sum of its proper divisors (193296037).

1378665563 is a wasteful number, since it uses less digits than its factorization.

1378665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8962.

The product of its digits is 2721600, while the sum is 50.

The square root of 1378665563 is about 37130.3859796798. The cubic root of 1378665563 is about 1112.9773065789.

The spelling of 1378665563 in words is "one billion, three hundred seventy-eight million, six hundred sixty-five thousand, five hundred sixty-three".