820047944297 has 4 divisors (see below), whose sum is σ = 820050329220. Its totient is φ = 820045559376.

The previous prime is 820047944291. The next prime is 820047944311. The reversal of 820047944297 is 792449740028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111548652121 + 708499292176 = 333989^2 + 841724^2 .

It is a cyclic number.

It is not a de Polignac number, because 820047944297 - 2⁸ = 820047944041 is a prime.

It is a super-2 number, since 2×820047944297² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820047944291) 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, 567518 + ... + 1400775.

It is an arithmetic number, because the mean of its divisors is an integer number (205012582305).

Almost surely, 2^820047944297 is an apocalyptic number.

It is an amenable number.

820047944297 is a deficient number, since it is larger than the sum of its proper divisors (2384923).

820047944297 is a wasteful number, since it uses less digits than its factorization.

820047944297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384922.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 820047944297 in words is "eight hundred twenty billion, forty-seven million, nine hundred forty-four thousand, two hundred ninety-seven".