66337961 has 8 divisors (see below), whose sum is σ = 70379784. Its totient is φ = 62311680.

The previous prime is 66337939. The next prime is 66337979. The reversal of 66337961 is 16973366.

It can be written as a sum of positive squares in 4 ways, for example, as 25441936 + 40896025 = 5044^2 + 6395^2 .

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 66337961 - 2⁶ = 66337897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66337981) 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, 5591 + ... + 12803.

It is an arithmetic number, because the mean of its divisors is an integer number (8797473).

Almost surely, 2^66337961 is an apocalyptic number.

It is an amenable number.

66337961 is a deficient number, since it is larger than the sum of its proper divisors (4041823).

66337961 is a wasteful number, since it uses less digits than its factorization.

66337961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7771.

The product of its digits is 122472, while the sum is 41.

The square root of 66337961 is about 8144.8119069749. The cubic root of 66337961 is about 404.8126166639.

The spelling of 66337961 in words is "sixty-six million, three hundred thirty-seven thousand, nine hundred sixty-one".