1811668853 has 4 divisors (see below), whose sum is σ = 1890437088. Its totient is φ = 1732900620.

The previous prime is 1811668849. The next prime is 1811668907. The reversal of 1811668853 is 3588661181.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1811668853 - 2² = 1811668849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1811668798 and 1811668807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811668153) 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, 39384083 + ... + 39384128.

It is an arithmetic number, because the mean of its divisors is an integer number (472609272).

Almost surely, 2^1811668853 is an apocalyptic number.

It is an amenable number.

1811668853 is a deficient number, since it is larger than the sum of its proper divisors (78768235).

1811668853 is an equidigital number, since it uses as much as digits as its factorization.

1811668853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78768234.

The product of its digits is 276480, while the sum is 47.

The square root of 1811668853 is about 42563.7034690357. The cubic root of 1811668853 is about 1219.0633438173.

The spelling of 1811668853 in words is "one billion, eight hundred eleven million, six hundred sixty-eight thousand, eight hundred fifty-three".