811920877903 has 4 divisors (see below), whose sum is σ = 812009786728. Its totient is φ = 811831969080.

The previous prime is 811920877853. The next prime is 811920877939. The reversal of 811920877903 is 309778029118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 811920877903 - 2²⁹ = 811384006991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811920871903) 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, 44440713 + ... + 44458978.

It is an arithmetic number, because the mean of its divisors is an integer number (203002446682).

Almost surely, 2^811920877903 is an apocalyptic number.

811920877903 is a deficient number, since it is larger than the sum of its proper divisors (88908825).

811920877903 is an equidigital number, since it uses as much as digits as its factorization.

811920877903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88908824.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 811920877903 in words is "eight hundred eleven billion, nine hundred twenty million, eight hundred seventy-seven thousand, nine hundred three".