75556521 has 24 divisors (see below), whose sum is σ = 116844000. Its totient is φ = 46904832.

The previous prime is 75556487. The next prime is 75556529. The reversal of 75556521 is 12565557.

It is a happy number.

75556521 is a `hidden beast` number, since 75 + 5 + 565 + 21 = 666.

It is not a de Polignac number, because 75556521 - 2⁶ = 75556457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75556529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6345 + ... + 13833.

It is an arithmetic number, because the mean of its divisors is an integer number (4868500).

Almost surely, 2^75556521 is an apocalyptic number.

It is an amenable number.

75556521 is a deficient number, since it is larger than the sum of its proper divisors (41287479).

75556521 is a wasteful number, since it uses less digits than its factorization.

75556521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7573 (or 7570 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 75556521 is about 8692.3254080827. The cubic root of 75556521 is about 422.7568476644.

The spelling of 75556521 in words is "seventy-five million, five hundred fifty-six thousand, five hundred twenty-one".