812581651372 has 12 divisors (see below), whose sum is σ = 1422049965336. Its totient is φ = 406281661280.

The previous prime is 812581651351. The next prime is 812581651381. The reversal of 812581651372 is 273156185218.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089633 + ... + 2447800.

It is an arithmetic number, because the mean of its divisors is an integer number (118504163778).

Almost surely, 2^812581651372 is an apocalyptic number.

It is an amenable number.

812581651372 is a deficient number, since it is larger than the sum of its proper divisors (609468313964).

812581651372 is a wasteful number, since it uses less digits than its factorization.

812581651372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4582208 (or 4582206 counting only the distinct ones).

The product of its digits is 806400, while the sum is 49.

The spelling of 812581651372 in words is "eight hundred twelve billion, five hundred eighty-one million, six hundred fifty-one thousand, three hundred seventy-two".