812728252066 has 32 divisors (see below), whose sum is σ = 1246024954368. Its totient is φ = 397436120640.

The previous prime is 812728252009. The next prime is 812728252079. The reversal of 812728252066 is 660252827218.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165758971 + ... + 165763873.

It is an arithmetic number, because the mean of its divisors is an integer number (38938279824).

Almost surely, 2^812728252066 is an apocalyptic number.

812728252066 is a deficient number, since it is larger than the sum of its proper divisors (433296702302).

812728252066 is a wasteful number, since it uses less digits than its factorization.

812728252066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9586.

The product of its (nonzero) digits is 1290240, while the sum is 49.

It can be divided in two parts, 81272 and 8252066, that added together give a palindrome (8333338).

The spelling of 812728252066 in words is "eight hundred twelve billion, seven hundred twenty-eight million, two hundred fifty-two thousand, sixty-six".