1966218853 has 4 divisors (see below), whose sum is σ = 1966843648. Its totient is φ = 1965594060.

The previous prime is 1966218847. The next prime is 1966218869. The reversal of 1966218853 is 3588126691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3588126691 = 383 ⋅9368477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1966218853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966218797 and 1966218806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966218893) 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, 307653 + ... + 313978.

It is an arithmetic number, because the mean of its divisors is an integer number (491710912).

Almost surely, 2^1966218853 is an apocalyptic number.

It is an amenable number.

1966218853 is a deficient number, since it is larger than the sum of its proper divisors (624795).

1966218853 is an equidigital number, since it uses as much as digits as its factorization.

1966218853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624794.

The product of its digits is 622080, while the sum is 49.

The square root of 1966218853 is about 44342.0664042622. The cubic root of 1966218853 is about 1252.7871361853.

The spelling of 1966218853 in words is "one billion, nine hundred sixty-six million, two hundred eighteen thousand, eight hundred fifty-three".