820137227912 has 36 divisors (see below), whose sum is σ = 1607638712085. Its totient is φ = 392211367680.

The previous prime is 820137227911. The next prime is 820137227963. The reversal of 820137227912 is 219722731028.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 812965509316 + 7171718596 = 901646^2 + 84686^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=640366.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820137227911) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 58906712 + ... + 58920632.

Almost surely, 2^820137227912 is an apocalyptic number.

It is an amenable number.

820137227912 is a deficient number, since it is larger than the sum of its proper divisors (787501484173).

820137227912 is an frugal number, since it uses more digits than its factorization.

820137227912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27894 (or 13946 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 820137227912 in words is "eight hundred twenty billion, one hundred thirty-seven million, two hundred twenty-seven thousand, nine hundred twelve".