61661214 has 24 divisors (see below), whose sum is σ = 133756272. Its totient is φ = 20529600.

The previous prime is 61661209. The next prime is 61661231. The reversal of 61661214 is 41216616.

61661214 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20614 + ... + 23414.

It is an arithmetic number, because the mean of its divisors is an integer number (5573178).

Almost surely, 2^61661214 is an apocalyptic number.

61661214 is an abundant number, since it is smaller than the sum of its proper divisors (72095058).

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

61661214 is a wasteful number, since it uses less digits than its factorization.

61661214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032 (or 4029 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 61661214 is about 7852.4654727035. The cubic root of 61661214 is about 395.0669416002.

The spelling of 61661214 in words is "sixty-one million, six hundred sixty-one thousand, two hundred fourteen".