66154441 has 8 divisors (see below), whose sum is σ = 67599360. Its totient is φ = 64716912.

The previous prime is 66154421. The next prime is 66154453. The reversal of 66154441 is 14445166.

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 66154441 - 2²¹ = 64057289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66154421) 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, 18670 + ... + 21928.

It is an arithmetic number, because the mean of its divisors is an integer number (8449920).

Almost surely, 2^66154441 is an apocalyptic number.

It is an amenable number.

66154441 is a deficient number, since it is larger than the sum of its proper divisors (1444919).

66154441 is a wasteful number, since it uses less digits than its factorization.

66154441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695.

The product of its digits is 11520, while the sum is 31.

The square root of 66154441 is about 8133.5380370414. The cubic root of 66154441 is about 404.4389752718.

The spelling of 66154441 in words is "sixty-six million, one hundred fifty-four thousand, four hundred forty-one".