812884745653 has 4 divisors (see below), whose sum is σ = 820342403980. Its totient is φ = 805427087328.

The previous prime is 812884745641. The next prime is 812884745671. The reversal of 812884745653 is 356547488218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 713487681124 + 99397064529 = 844682^2 + 315273^2 .

It is a cyclic number.

It is not a de Polignac number, because 812884745653 - 2²⁵ = 812851191221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 812884745591 and 812884745600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812884745623) 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, 3728829000 + ... + 3728829217.

It is an arithmetic number, because the mean of its divisors is an integer number (205085600995).

Almost surely, 2^812884745653 is an apocalyptic number.

It is an amenable number.

812884745653 is a deficient number, since it is larger than the sum of its proper divisors (7457658327).

812884745653 is a wasteful number, since it uses less digits than its factorization.

812884745653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7457658326.

The product of its digits is 51609600, while the sum is 61.

The spelling of 812884745653 in words is "eight hundred twelve billion, eight hundred eighty-four million, seven hundred forty-five thousand, six hundred fifty-three".