812518067653 has 2 divisors, whose sum is σ = 812518067654. Its totient is φ = 812518067652.

The previous prime is 812518067611. The next prime is 812518067671. The reversal of 812518067653 is 356760815218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677580861409 + 134937206244 = 823153^2 + 367338^2 .

It is a cyclic number.

It is not a de Polignac number, because 812518067653 - 2²¹ = 812515970501 is a prime.

It is a super-2 number, since 2×812518067653² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 812518067653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812518767653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406259033826 + 406259033827.

It is an arithmetic number, because the mean of its divisors is an integer number (406259033827).

Almost surely, 2^812518067653 is an apocalyptic number.

It is an amenable number.

812518067653 is a deficient number, since it is larger than the sum of its proper divisors (1).

812518067653 is an equidigital number, since it uses as much as digits as its factorization.

812518067653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 812518067653 in words is "eight hundred twelve billion, five hundred eighteen million, sixty-seven thousand, six hundred fifty-three".