66686546 has 16 divisors (see below), whose sum is σ = 106087320. Its totient is φ = 31330560.

The previous prime is 66686539. The next prime is 66686551. The reversal of 66686546 is 64568666.

It can be written as a sum of positive squares in 4 ways, for example, as 50965321 + 15721225 = 7139^2 + 3965^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66686546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26720 + ... + 29108.

Almost surely, 2^66686546 is an apocalyptic number.

66686546 is a deficient number, since it is larger than the sum of its proper divisors (39400774).

66686546 is a wasteful number, since it uses less digits than its factorization.

66686546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229.

The product of its digits is 1244160, while the sum is 47.

The square root of 66686546 is about 8166.1830741173. The cubic root of 66686546 is about 405.5204324065.

The spelling of 66686546 in words is "sixty-six million, six hundred eighty-six thousand, five hundred forty-six".