66164551 has 8 divisors (see below), whose sum is σ = 67018320. Its totient is φ = 65315712.

The previous prime is 66164543. The next prime is 66164569. The reversal of 66164551 is 15546166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66164551 - 2³ = 66164543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66164531) 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, 30945 + ... + 33013.

It is an arithmetic number, because the mean of its divisors is an integer number (8377290).

Almost surely, 2^66164551 is an apocalyptic number.

66164551 is a deficient number, since it is larger than the sum of its proper divisors (853769).

66164551 is a wasteful number, since it uses less digits than its factorization.

66164551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its digits is 21600, while the sum is 34.

The square root of 66164551 is about 8134.1595140494. The cubic root of 66164551 is about 404.4595769109.

The spelling of 66164551 in words is "sixty-six million, one hundred sixty-four thousand, five hundred fifty-one".