66466665 has 48 divisors (see below), whose sum is σ = 121305600. Its totient is φ = 33601920.

The previous prime is 66466661. The next prime is 66466667. The reversal of 66466665 is 56666466.

It is not a de Polignac number, because 66466665 - 2² = 66466661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66466665.

It is not an unprimeable number, because it can be changed into a prime (66466661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154000 + ... + 154430.

It is an arithmetic number, because the mean of its divisors is an integer number (2527200).

Almost surely, 2^66466665 is an apocalyptic number.

It is an amenable number.

66466665 is a deficient number, since it is larger than the sum of its proper divisors (54838935).

66466665 is a wasteful number, since it uses less digits than its factorization.

66466665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 611 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 66466665 is about 8152.7090589570. The cubic root of 66466665 is about 405.0742433621.

The spelling of 66466665 in words is "sixty-six million, four hundred sixty-six thousand, six hundred sixty-five".