83609785521 has 32 divisors (see below), whose sum is σ = 127289323520. Its totient is φ = 54201301632.

The previous prime is 83609785499. The next prime is 83609785547. The reversal of 83609785521 is 12558790638.

83609785521 is a `hidden beast` number, since 8 + 3 + 609 + 7 + 8 + 5 + 5 + 21 = 666.

It is not a de Polignac number, because 83609785521 - 2¹⁰ = 83609784497 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83609785561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1727376 + ... + 1775118.

It is an arithmetic number, because the mean of its divisors is an integer number (3977791360).

Almost surely, 2^83609785521 is an apocalyptic number.

It is an amenable number.

83609785521 is a deficient number, since it is larger than the sum of its proper divisors (43679537999).

83609785521 is a wasteful number, since it uses less digits than its factorization.

83609785521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49542 (or 49536 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 83609785521 in words is "eighty-three billion, six hundred nine million, seven hundred eighty-five thousand, five hundred twenty-one".