66900550 has 24 divisors (see below), whose sum is σ = 125273232. Its totient is φ = 26580000.

The previous prime is 66900541. The next prime is 66900563. The reversal of 66900550 is 5500966.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3120 + ... + 11980.

It is an arithmetic number, because the mean of its divisors is an integer number (5219718).

Almost surely, 2^66900550 is an apocalyptic number.

66900550 is a deficient number, since it is larger than the sum of its proper divisors (58372682).

66900550 is a wasteful number, since it uses less digits than its factorization.

66900550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9024 (or 9019 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 66900550 is about 8179.2756402997. The cubic root of 66900550 is about 405.9537548336.

The spelling of 66900550 in words is "sixty-six million, nine hundred thousand, five hundred fifty".