7066521 has 60 divisors (see below), whose sum is σ = 13389376. Its totient is φ = 3635280.

The previous prime is 7066487. The next prime is 7066523. The reversal of 7066521 is 1256607.

7066521 is a `hidden beast` number, since 7 + 0 + 6 + 652 + 1 = 666.

It is not a de Polignac number, because 7066521 - 2⁷ = 7066393 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7066523) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 68556 + ... + 68658.

Almost surely, 2^7066521 is an apocalyptic number.

It is an amenable number.

7066521 is a deficient number, since it is larger than the sum of its proper divisors (6322855).

7066521 is a wasteful number, since it uses less digits than its factorization.

7066521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 7066521 is about 2658.2928732553. The cubic root of 7066521 is about 191.8971617249.

It can be divided in two parts, 706 and 6521, that added together give a palindrome (7227).

The spelling of 7066521 in words is "seven million, sixty-six thousand, five hundred twenty-one".