66580745 has 64 divisors (see below), whose sum is σ = 106389504. Its totient is φ = 38776320.

The previous prime is 66580741. The next prime is 66580751. The reversal of 66580745 is 54708566.

It is not a de Polignac number, because 66580745 - 2² = 66580741 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66580741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 646364 + ... + 646466.

It is an arithmetic number, because the mean of its divisors is an integer number (1662336).

Almost surely, 2^66580745 is an apocalyptic number.

It is an amenable number.

66580745 is a deficient number, since it is larger than the sum of its proper divisors (39808759).

66580745 is a wasteful number, since it uses less digits than its factorization.

66580745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 66580745 is about 8159.7025068320. The cubic root of 66580745 is about 405.3058605037.

The spelling of 66580745 in words is "sixty-six million, five hundred eighty thousand, seven hundred forty-five".