66554025 has 12 divisors (see below), whose sum is σ = 110036112. Its totient is φ = 35495440.

The previous prime is 66553999. The next prime is 66554039. The reversal of 66554025 is 52045566.

It is a happy number.

It is not a de Polignac number, because 66554025 - 2⁶ = 66553961 is a prime.

It is a Curzon 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, 443619 + ... + 443768.

It is an arithmetic number, because the mean of its divisors is an integer number (9169676).

Almost surely, 2^66554025 is an apocalyptic number.

It is an amenable number.

66554025 is a deficient number, since it is larger than the sum of its proper divisors (43482087).

66554025 is a wasteful number, since it uses less digits than its factorization.

66554025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887400 (or 887395 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 66554025 is about 8158.0650279340. The cubic root of 66554025 is about 405.2516345077.

The spelling of 66554025 in words is "sixty-six million, five hundred fifty-four thousand, twenty-five".