1618971863 has 16 divisors (see below), whose sum is σ = 1797811200. Its totient is φ = 1450094976.

The previous prime is 1618971847. The next prime is 1618971883. The reversal of 1618971863 is 3681798161.

It is a cyclic number.

It is not a de Polignac number, because 1618971863 - 2⁴ = 1618971847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618971803) 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, 67406 + ... + 88212.

It is an arithmetic number, because the mean of its divisors is an integer number (112363200).

Almost surely, 2^1618971863 is an apocalyptic number.

1618971863 is a deficient number, since it is larger than the sum of its proper divisors (178839337).

1618971863 is a wasteful number, since it uses less digits than its factorization.

1618971863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21046.

The product of its digits is 435456, while the sum is 50.

The square root of 1618971863 is about 40236.4494333185. The cubic root of 1618971863 is about 1174.2117817291.

The spelling of 1618971863 in words is "one billion, six hundred eighteen million, nine hundred seventy-one thousand, eight hundred sixty-three".