1916218863 has 80 divisors (see below), whose sum is σ = 3198000960. Its totient is φ = 1135793664.

The previous prime is 1916218859. The next prime is 1916218891. The reversal of 1916218863 is 3688126191.

1916218863 is a `hidden beast` number, since 19 + 1 + 621 + 8 + 8 + 6 + 3 = 666.

It is not a de Polignac number, because 1916218863 - 2² = 1916218859 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916218853) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5337478 + ... + 5337836.

It is an arithmetic number, because the mean of its divisors is an integer number (39975012).

Almost surely, 2^1916218863 is an apocalyptic number.

1916218863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1916218863 is a deficient number, since it is larger than the sum of its proper divisors (1281782097).

1916218863 is a wasteful number, since it uses less digits than its factorization.

1916218863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 549 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1916218863 is about 43774.6372115178. The cubic root of 1916218863 is about 1242.0765723287.

It can be divided in two parts, 19162 and 18863, that added together give a square (38025 = 195²).

The spelling of 1916218863 in words is "one billion, nine hundred sixteen million, two hundred eighteen thousand, eight hundred sixty-three".