61661204 has 24 divisors (see below), whose sum is σ = 118389600. Its totient is φ = 27867680.

The previous prime is 61661189. The next prime is 61661209. The reversal of 61661204 is 40216616.

It is a happy number.

It is a super-3 number, since 3×61661204³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3962 + ... + 11790.

It is an arithmetic number, because the mean of its divisors is an integer number (4932900).

Almost surely, 2^61661204 is an apocalyptic number.

It is an amenable number.

61661204 is a deficient number, since it is larger than the sum of its proper divisors (56728396).

61661204 is a wasteful number, since it uses less digits than its factorization.

61661204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8023 (or 8021 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 61661204 is about 7852.4648359607. The cubic root of 61661204 is about 395.0669202433.

The spelling of 61661204 in words is "sixty-one million, six hundred sixty-one thousand, two hundred four".