823780291473 has 12 divisors (see below), whose sum is σ = 1191583160820. Its totient is φ = 548412263136.

The previous prime is 823780291441. The next prime is 823780291487. The reversal of 823780291473 is 374192087328.

823780291473 is a `hidden beast` number, since 8 + 2 + 3 + 7 + 80 + 2 + 91 + 473 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 323997747264 + 499782544209 = 569208^2 + 706953^2 .

It is not a de Polignac number, because 823780291473 - 2⁵ = 823780291441 is a prime.

It is a super-2 number, since 2×823780291473² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (823780291423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64543086 + ... + 64555847.

It is an arithmetic number, because the mean of its divisors is an integer number (99298596735).

Almost surely, 2^823780291473 is an apocalyptic number.

It is an amenable number.

823780291473 is a deficient number, since it is larger than the sum of its proper divisors (367802869347).

823780291473 is a wasteful number, since it uses less digits than its factorization.

823780291473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129099648 (or 129099645 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 823780291473 in words is "eight hundred twenty-three billion, seven hundred eighty million, two hundred ninety-one thousand, four hundred seventy-three".