66665344 has 32 divisors (see below), whose sum is σ = 136059840. Its totient is φ = 32517120.

The previous prime is 66665341. The next prime is 66665359. The reversal of 66665344 is 44356666.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 66665297 and 66665306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104 + ... + 11599.

It is an arithmetic number, because the mean of its divisors is an integer number (4251870).

Almost surely, 2^66665344 is an apocalyptic number.

66665344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66665344 is an abundant number, since it is smaller than the sum of its proper divisors (69394496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66665344 is a wasteful number, since it uses less digits than its factorization.

66665344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12758 (or 12746 counting only the distinct ones).

The product of its digits is 311040, while the sum is 40.

The square root of 66665344 is about 8164.8848124147. The cubic root of 66665344 is about 405.4774514452.

The spelling of 66665344 in words is "sixty-six million, six hundred sixty-five thousand, three hundred forty-four".