828021850657 has 6 divisors (see below), whose sum is σ = 873895637778. Its totient is φ = 784441752912.

The previous prime is 828021850637. The next prime is 828021850673. The reversal of 828021850657 is 756058120828.

It can be written as a sum of positive squares in only one way, i.e., 514202292241 + 313819558416 = 717079^2 + 560196^2 .

It is not a de Polignac number, because 828021850657 - 2¹¹ = 828021848609 is a prime.

It is a super-2 number, since 2×828021850657² (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 (828021850637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1146844308 + ... + 1146845029.

It is an arithmetic number, because the mean of its divisors is an integer number (145649272963).

Almost surely, 2^828021850657 is an apocalyptic number.

It is an amenable number.

828021850657 is a deficient number, since it is larger than the sum of its proper divisors (45873787121).

828021850657 is a wasteful number, since it uses less digits than its factorization.

828021850657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293689375 (or 2293689356 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 828021850657 in words is "eight hundred twenty-eight billion, twenty-one million, eight hundred fifty thousand, six hundred fifty-seven".