66340555 has 8 divisors (see below), whose sum is σ = 79927344. Its totient is φ = 52860000.

The previous prime is 66340543. The next prime is 66340559. The reversal of 66340555 is 55504366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66340555 - 2¹¹ = 66338507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66340555.

It is not an unprimeable number, because it can be changed into a prime (66340559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25176 + ... + 27685.

It is an arithmetic number, because the mean of its divisors is an integer number (9990918).

Almost surely, 2^66340555 is an apocalyptic number.

66340555 is a deficient number, since it is larger than the sum of its proper divisors (13586789).

66340555 is a wasteful number, since it uses less digits than its factorization.

66340555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53117.

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 66340555 is about 8144.9711478924. The cubic root of 66340555 is about 404.8178930306.

The spelling of 66340555 in words is "sixty-six million, three hundred forty thousand, five hundred fifty-five".