655521983 has 4 divisors (see below), whose sum is σ = 690023160. Its totient is φ = 621020808.

The previous prime is 655521961. The next prime is 655522027. The reversal of 655521983 is 389125556.

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 655521983 - 2¹² = 655517887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655524983) 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 3 ways as a sum of consecutive naturals, for example, 17250560 + ... + 17250597.

It is an arithmetic number, because the mean of its divisors is an integer number (172505790).

Almost surely, 2^655521983 is an apocalyptic number.

655521983 is a deficient number, since it is larger than the sum of its proper divisors (34501177).

655521983 is a wasteful number, since it uses less digits than its factorization.

655521983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34501176.

The product of its digits is 324000, while the sum is 44.

The square root of 655521983 is about 25603.1635350009. The cubic root of 655521983 is about 868.6851954628.

The spelling of 655521983 in words is "six hundred fifty-five million, five hundred twenty-one thousand, nine hundred eighty-three".