65550555 has 48 divisors (see below), whose sum is σ = 137502144. Its totient is φ = 28200960.

The previous prime is 65550503. The next prime is 65550557. The reversal of 65550555 is 55505556.

65550555 is a `hidden beast` number, since 6 + 55 + 50 + 555 = 666.

It is not a de Polignac number, because 65550555 - 2⁷ = 65550427 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (65550557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 766 + ... + 11475.

It is an arithmetic number, because the mean of its divisors is an integer number (2864628).

Almost surely, 2^65550555 is an apocalyptic number.

65550555 is an abundant number, since it is smaller than the sum of its proper divisors (71951589).

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

65550555 is a wasteful number, since it uses less digits than its factorization.

65550555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12276 (or 12273 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 36.

The square root of 65550555 is about 8096.3297240169. The cubic root of 65550555 is about 403.2045810078.

The spelling of 65550555 in words is "sixty-five million, five hundred fifty thousand, five hundred fifty-five".