66520336 has 15 divisors (see below), whose sum is σ = 128946391. Its totient is φ = 33243856.

The previous prime is 66520331. The next prime is 66520351. The reversal of 66520336 is 63302566.

The square root of 66520336 is 8156.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66520298 and 66520307.

It is not an unprimeable number, because it can be changed into a prime (66520331) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31605 + ... + 33643.

Almost surely, 2^66520336 is an apocalyptic number.

66520336 is the 8156-th square number.

It is an amenable number.

66520336 is a deficient number, since it is larger than the sum of its proper divisors (62426055).

66520336 is an frugal number, since it uses more digits than its factorization.

66520336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 31.

The cubic root of 66520336 is about 405.1832448220.

The spelling of 66520336 in words is "sixty-six million, five hundred twenty thousand, three hundred thirty-six".