66520052 has 12 divisors (see below), whose sum is σ = 116524800. Its totient is φ = 33227256.

The previous prime is 66520039. The next prime is 66520061. The reversal of 66520052 is 25002566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3302 + ... + 11997.

It is an arithmetic number, because the mean of its divisors is an integer number (9710400).

Almost surely, 2^66520052 is an apocalyptic number.

It is an amenable number.

66520052 is a deficient number, since it is larger than the sum of its proper divisors (50004748).

66520052 is a wasteful number, since it uses less digits than its factorization.

66520052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390 (or 16388 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 66520052 is about 8155.9825894861. The cubic root of 66520052 is about 405.1826681953.

The spelling of 66520052 in words is "sixty-six million, five hundred twenty thousand, fifty-two".