821650883539 has 4 divisors (see below), whose sum is σ = 821936280960. Its totient is φ = 821365486120.

The previous prime is 821650883509. The next prime is 821650883561. The reversal of 821650883539 is 935388056128.

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

It is a cyclic number.

It is not a de Polignac number, because 821650883539 - 2²⁵ = 821617329107 is a prime.

It is a super-2 number, since 2×821650883539² (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 (821650883509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142694392 + ... + 142700149.

It is an arithmetic number, because the mean of its divisors is an integer number (205484070240).

Almost surely, 2^821650883539 is an apocalyptic number.

821650883539 is a deficient number, since it is larger than the sum of its proper divisors (285397421).

821650883539 is a wasteful number, since it uses less digits than its factorization.

821650883539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285397420.

The product of its (nonzero) digits is 12441600, while the sum is 58.

The spelling of 821650883539 in words is "eight hundred twenty-one billion, six hundred fifty million, eight hundred eighty-three thousand, five hundred thirty-nine".