4278891563 has 4 divisors (see below), whose sum is σ = 4321256928. Its totient is φ = 4236526200.

The previous prime is 4278891553. The next prime is 4278891581. The reversal of 4278891563 is 3651988724.

4278891563 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4278891563 - 2⁶ = 4278891499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4278891553) 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, 21182531 + ... + 21182732.

It is an arithmetic number, because the mean of its divisors is an integer number (1080314232).

Almost surely, 2^4278891563 is an apocalyptic number.

4278891563 is a deficient number, since it is larger than the sum of its proper divisors (42365365).

4278891563 is a wasteful number, since it uses less digits than its factorization.

4278891563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42365364.

The product of its digits is 2903040, while the sum is 53.

The square root of 4278891563 is about 65413.2369096653. The cubic root of 4278891563 is about 1623.4681027392.

The spelling of 4278891563 in words is "four billion, two hundred seventy-eight million, eight hundred ninety-one thousand, five hundred sixty-three".