812655507921 has 8 divisors (see below), whose sum is σ = 1083577170240. Its totient is φ = 541752092112.

The previous prime is 812655507913. The next prime is 812655507929. The reversal of 812655507921 is 129705556218.

It is an interprime number because it is at equal distance from previous prime (812655507913) and next prime (812655507929).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 812655507921 - 2³ = 812655507913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812655507929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4457365 + ... + 4636098.

It is an arithmetic number, because the mean of its divisors is an integer number (135447146280).

Almost surely, 2^812655507921 is an apocalyptic number.

It is an amenable number.

812655507921 is a deficient number, since it is larger than the sum of its proper divisors (270921662319).

812655507921 is a wasteful number, since it uses less digits than its factorization.

812655507921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123255.

The product of its (nonzero) digits is 1512000, while the sum is 51.

The spelling of 812655507921 in words is "eight hundred twelve billion, six hundred fifty-five million, five hundred seven thousand, nine hundred twenty-one".