66580465 has 24 divisors (see below), whose sum is σ = 97839360. Its totient is φ = 43249248.

The previous prime is 66580411. The next prime is 66580477. The reversal of 66580465 is 56408566.

It is not a de Polignac number, because 66580465 - 2¹⁵ = 66547697 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2497 + ... + 11806.

It is an arithmetic number, because the mean of its divisors is an integer number (4076640).

Almost surely, 2^66580465 is an apocalyptic number.

It is an amenable number.

66580465 is a deficient number, since it is larger than the sum of its proper divisors (31258895).

66580465 is a wasteful number, since it uses less digits than its factorization.

66580465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14341 (or 14334 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 66580465 is about 8159.6853493257. The cubic root of 66580465 is about 405.3052923424.

It can be divided in two parts, 665 and 80465, that multiplied together give a square (53509225 = 7315²).

The spelling of 66580465 in words is "sixty-six million, five hundred eighty thousand, four hundred sixty-five".