812121686472 has 16 divisors (see below), whose sum is σ = 2030304216240. Its totient is φ = 270707228816.

The previous prime is 812121686459. The next prime is 812121686543. The reversal of 812121686472 is 274686121218.

It is a happy number.

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, 16919201778 + ... + 16919201825.

It is an arithmetic number, because the mean of its divisors is an integer number (126894013515).

Almost surely, 2^812121686472 is an apocalyptic number.

It is an amenable number.

812121686472 is an abundant number, since it is smaller than the sum of its proper divisors (1218182529768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812121686472 is a wasteful number, since it uses less digits than its factorization.

812121686472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33838403612 (or 33838403608 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The spelling of 812121686472 in words is "eight hundred twelve billion, one hundred twenty-one million, six hundred eighty-six thousand, four hundred seventy-two".