66550416 has 40 divisors (see below), whose sum is σ = 173036544. Its totient is φ = 22039680.

The previous prime is 66550409. The next prime is 66550441. The reversal of 66550416 is 61405566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3121 + ... + 11951.

Almost surely, 2^66550416 is an apocalyptic number.

It is an amenable number.

66550416 is an abundant number, since it is smaller than the sum of its proper divisors (106486128).

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

66550416 is a wasteful number, since it uses less digits than its factorization.

66550416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999 (or 8993 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 66550416 is about 8157.8438327784. The cubic root of 66550416 is about 405.2443092328.

It can be divided in two parts, 66550 and 416, that added together give a palindrome (66966).

The spelling of 66550416 in words is "sixty-six million, five hundred fifty thousand, four hundred sixteen".