1953818863 has 4 divisors (see below), whose sum is σ = 1954224360. Its totient is φ = 1953413368.

The previous prime is 1953818861. The next prime is 1953818899. The reversal of 1953818863 is 3688183591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3688183591 = 2389 ⋅1543819.

It is a cyclic number.

It is not a de Polignac number, because 1953818863 - 2¹ = 1953818861 is a prime.

It is a super-2 number, since 2×1953818863² = 7634816298829225538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1953818863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1953818861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195433 + ... + 205186.

It is an arithmetic number, because the mean of its divisors is an integer number (488556090).

Almost surely, 2^1953818863 is an apocalyptic number.

1953818863 is a deficient number, since it is larger than the sum of its proper divisors (405497).

1953818863 is an equidigital number, since it uses as much as digits as its factorization.

1953818863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405496.

The product of its digits is 1244160, while the sum is 52.

The square root of 1953818863 is about 44202.0232907952. The cubic root of 1953818863 is about 1250.1480065812.

The spelling of 1953818863 in words is "one billion, nine hundred fifty-three million, eight hundred eighteen thousand, eight hundred sixty-three".