61660206 has 48 divisors (see below), whose sum is σ = 145501200. Its totient is φ = 18797184.

The previous prime is 61660201. The next prime is 61660213. The reversal of 61660206 is 60206616.

It is a self number, because there is not a number n which added to its sum of digits gives 61660206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6810 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (3031275).

Almost surely, 2^61660206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61660206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72750600).

61660206 is an abundant number, since it is smaller than the sum of its proper divisors (83840994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61660206 is a wasteful number, since it uses less digits than its factorization.

61660206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6273 (or 6270 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61660206 is about 7852.4012887778. The cubic root of 61660206 is about 395.0647888171.

The spelling of 61660206 in words is "sixty-one million, six hundred sixty thousand, two hundred six".