812269640519 has 4 divisors (see below), whose sum is σ = 829551973344. Its totient is φ = 794987307696.

The previous prime is 812269640467. The next prime is 812269640543. The reversal of 812269640519 is 915046962218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 915046962218 = 2 ⋅457523481109.

It is a de Polignac number, because none of the positive numbers 2^k-812269640519 is a prime.

It is a super-2 number, since 2×812269640519² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812269649519) 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, 8641166342 + ... + 8641166435.

It is an arithmetic number, because the mean of its divisors is an integer number (207387993336).

Almost surely, 2^812269640519 is an apocalyptic number.

812269640519 is a deficient number, since it is larger than the sum of its proper divisors (17282332825).

812269640519 is a wasteful number, since it uses less digits than its factorization.

812269640519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17282332824.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 812269640519 in words is "eight hundred twelve billion, two hundred sixty-nine million, six hundred forty thousand, five hundred nineteen".