70665 has 16 divisors (see below), whose sum is σ = 129408. Its totient is φ = 32256.

The previous prime is 70663. The next prime is 70667. The reversal of 70665 is 56607.

It is an interprime number because it is at equal distance from previous prime (70663) and next prime (70667).

It is not a de Polignac number, because 70665 - 2¹ = 70663 is a prime.

70665 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 70665.

It is not an unprimeable number, because it can be changed into a prime (70663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232 + ... + 441.

It is an arithmetic number, because the mean of its divisors is an integer number (8088).

2⁷⁰⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

70665 is a deficient number, since it is larger than the sum of its proper divisors (58743).

70665 is a wasteful number, since it uses less digits than its factorization.

70665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 70665 is about 265.8288923349. The cubic root of 70665 is about 41.3429492600.

The spelling of 70665 in words is "seventy thousand, six hundred sixty-five".