66025555 has 8 divisors (see below), whose sum is σ = 79322400. Its totient is φ = 52759296.

The previous prime is 66025537. The next prime is 66025577. The reversal of 66025555 is 55552066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66025555 - 2⁵ = 66025523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66025555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2590 + ... + 11779.

It is an arithmetic number, because the mean of its divisors is an integer number (9915300).

Almost surely, 2^66025555 is an apocalyptic number.

66025555 is a deficient number, since it is larger than the sum of its proper divisors (13296845).

66025555 is a wasteful number, since it uses less digits than its factorization.

66025555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15293.

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 66025555 is about 8125.6110539454. The cubic root of 66025555 is about 404.1761538615.

The spelling of 66025555 in words is "sixty-six million, twenty-five thousand, five hundred fifty-five".