66520605 has 16 divisors (see below), whose sum is σ = 106534080. Its totient is φ = 35443968.

The previous prime is 66520591. The next prime is 66520627. The reversal of 66520605 is 50602566.

It is not a de Polignac number, because 66520605 - 2¹² = 66516509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30181 + ... + 32309.

It is an arithmetic number, because the mean of its divisors is an integer number (6658380).

Almost surely, 2^66520605 is an apocalyptic number.

It is an amenable number.

66520605 is a deficient number, since it is larger than the sum of its proper divisors (40013475).

66520605 is a wasteful number, since it uses less digits than its factorization.

66520605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66520605 is about 8156.0164909103. The cubic root of 66520605 is about 405.1837909915.

The spelling of 66520605 in words is "sixty-six million, five hundred twenty thousand, six hundred five".