61660211 has 8 divisors (see below), whose sum is σ = 62704320. Its totient is φ = 60622848.

The previous prime is 61660201. The next prime is 61660213. The reversal of 61660211 is 11206616.

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-61660211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61660213) 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, 18785 + ... + 21821.

It is an arithmetic number, because the mean of its divisors is an integer number (7838040).

Almost surely, 2^61660211 is an apocalyptic number.

61660211 is a deficient number, since it is larger than the sum of its proper divisors (1044109).

61660211 is a wasteful number, since it uses less digits than its factorization.

61660211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 61660211 is about 7852.4016071518. The cubic root of 61660211 is about 395.0647994957.

Adding to 61660211 its reverse (11206616), we get a palindrome (72866827).

The spelling of 61660211 in words is "sixty-one million, six hundred sixty thousand, two hundred eleven".