66610416 has 20 divisors (see below), whose sum is σ = 172077032. Its totient is φ = 22203456.

The previous prime is 66610381. The next prime is 66610417. The reversal of 66610416 is 61401666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693811 + ... + 693906.

Almost surely, 2^66610416 is an apocalyptic number.

It is an amenable number.

66610416 is an abundant number, since it is smaller than the sum of its proper divisors (105466616).

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

66610416 is a wasteful number, since it uses less digits than its factorization.

66610416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387728 (or 1387722 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66610416 is about 8161.5204465835. The cubic root of 66610416 is about 405.3660583093.

The spelling of 66610416 in words is "sixty-six million, six hundred ten thousand, four hundred sixteen".