66147551 has 8 divisors (see below), whose sum is σ = 67567824. Its totient is φ = 64733760.

The previous prime is 66147541. The next prime is 66147553. The reversal of 66147551 is 15574166.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66147551 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 (66147553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22856 + ... + 25586.

It is an arithmetic number, because the mean of its divisors is an integer number (8445978).

Almost surely, 2^66147551 is an apocalyptic number.

66147551 is a deficient number, since it is larger than the sum of its proper divisors (1420273).

66147551 is a wasteful number, since it uses less digits than its factorization.

66147551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241.

The product of its digits is 25200, while the sum is 35.

The square root of 66147551 is about 8133.1144710990. The cubic root of 66147551 is about 404.4249339807.

The spelling of 66147551 in words is "sixty-six million, one hundred forty-seven thousand, five hundred fifty-one".