66156441 has 32 divisors (see below), whose sum is σ = 100058112. Its totient is φ = 38575680.

The previous prime is 66156439. The next prime is 66156443. The reversal of 66156441 is 14465166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66156439) and next prime (66156443).

It is not a de Polignac number, because 66156441 - 2¹ = 66156439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66156443) 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 31 ways as a sum of consecutive naturals, for example, 117226 + ... + 117788.

It is an arithmetic number, because the mean of its divisors is an integer number (3126816).

Almost surely, 2^66156441 is an apocalyptic number.

It is an amenable number.

66156441 is a deficient number, since it is larger than the sum of its proper divisors (33901671).

66156441 is a wasteful number, since it uses less digits than its factorization.

66156441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733.

The product of its digits is 17280, while the sum is 33.

The square root of 66156441 is about 8133.6609838375. The cubic root of 66156441 is about 404.4430509357.

The spelling of 66156441 in words is "sixty-six million, one hundred fifty-six thousand, four hundred forty-one".