65667645 has 32 divisors (see below), whose sum is σ = 121824000. Its totient is φ = 33498432.

The previous prime is 65667643. The next prime is 65667653. The reversal of 65667645 is 54676656.

65667645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65667645 - 2¹ = 65667643 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 65667645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65667643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7470 + ... + 13679.

It is an arithmetic number, because the mean of its divisors is an integer number (3807000).

Almost surely, 2^65667645 is an apocalyptic number.

It is an amenable number.

65667645 is a deficient number, since it is larger than the sum of its proper divisors (56156355).

65667645 is a wasteful number, since it uses less digits than its factorization.

65667645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21186 (or 21180 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 65667645 is about 8103.5575520878. The cubic root of 65667645 is about 403.4445135903. Note that the first 3 decimals are identical.

The spelling of 65667645 in words is "sixty-five million, six hundred sixty-seven thousand, six hundred forty-five".