61664650 has 24 divisors (see below), whose sum is σ = 114903360. Its totient is φ = 24621360.

The previous prime is 61664579. The next prime is 61664651. The reversal of 61664650 is 5646616.

It is not an unprimeable number, because it can be changed into a prime (61664651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51357 + ... + 52543.

It is an arithmetic number, because the mean of its divisors is an integer number (4787640).

Almost surely, 2^61664650 is an apocalyptic number.

61664650 is a deficient number, since it is larger than the sum of its proper divisors (53238710).

61664650 is a wasteful number, since it uses less digits than its factorization.

61664650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238 (or 2233 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 61664650 is about 7852.6842544445. The cubic root of 61664650 is about 395.0742796804.

It can be divided in two parts, 6166 and 4650, that added together give a square (10816 = 104²).

The spelling of 61664650 in words is "sixty-one million, six hundred sixty-four thousand, six hundred fifty".