66506455 has 8 divisors (see below), whose sum is σ = 83277792. Its totient is φ = 50891808.

The previous prime is 66506443. The next prime is 66506477. The reversal of 66506455 is 55460566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66506455 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289044 + ... + 289273.

It is an arithmetic number, because the mean of its divisors is an integer number (10409724).

Almost surely, 2^66506455 is an apocalyptic number.

66506455 is a deficient number, since it is larger than the sum of its proper divisors (16771337).

66506455 is a wasteful number, since it uses less digits than its factorization.

66506455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578345.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 66506455 is about 8155.1489869898. The cubic root of 66506455 is about 405.1550592564.

It can be divided in two parts, 66 and 506455, that added together give a triangular number (506521 = T₁₀₀₆).

The spelling of 66506455 in words is "sixty-six million, five hundred six thousand, four hundred fifty-five".