66520550 has 12 divisors (see below), whose sum is σ = 123728316. Its totient is φ = 26608200.

The previous prime is 66520547. The next prime is 66520583. The reversal of 66520550 is 5502566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665156 + ... + 665255.

It is an arithmetic number, because the mean of its divisors is an integer number (10310693).

Almost surely, 2^66520550 is an apocalyptic number.

66520550 is a deficient number, since it is larger than the sum of its proper divisors (57207766).

66520550 is a wasteful number, since it uses less digits than its factorization.

66520550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330423 (or 1330418 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 66520550 is about 8156.0131191655. The cubic root of 66520550 is about 405.1836793213.

The spelling of 66520550 in words is "sixty-six million, five hundred twenty thousand, five hundred fifty".