83555559021 has 16 divisors (see below), whose sum is σ = 121543031808. Its totient is φ = 50636535600.

The previous prime is 83555559013. The next prime is 83555559071. The reversal of 83555559021 is 12095555538.

It is not a de Polignac number, because 83555559021 - 2³ = 83555559013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83555559071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517276 + ... + 659306.

It is an arithmetic number, because the mean of its divisors is an integer number (7596439488).

Almost surely, 2^83555559021 is an apocalyptic number.

It is an amenable number.

83555559021 is a deficient number, since it is larger than the sum of its proper divisors (37987472787).

83555559021 is a wasteful number, since it uses less digits than its factorization.

83555559021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159872.

The product of its (nonzero) digits is 1350000, while the sum is 48.

The spelling of 83555559021 in words is "eighty-three billion, five hundred fifty-five million, five hundred fifty-nine thousand, twenty-one".