61604666 has 4 divisors (see below), whose sum is σ = 92407002. Its totient is φ = 30802332.

The previous prime is 61604663. The next prime is 61604677. The reversal of 61604666 is 66640616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 32821441 + 28783225 = 5729^2 + 5365^2 .

It is not an unprimeable number, because it can be changed into a prime (61604663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15401165 + ... + 15401168.

Almost surely, 2^61604666 is an apocalyptic number.

61604666 is a deficient number, since it is larger than the sum of its proper divisors (30802336).

61604666 is a wasteful number, since it uses less digits than its factorization.

61604666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30802335.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 61604666 is about 7848.8639942351. The cubic root of 61604666 is about 394.9461359014.

The spelling of 61604666 in words is "sixty-one million, six hundred four thousand, six hundred sixty-six".