66530648 has 16 divisors (see below), whose sum is σ = 125400960. Its totient is φ = 33090400.

The previous prime is 66530641. The next prime is 66530689. The reversal of 66530648 is 84603566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66530641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20243 + ... + 23298.

It is an arithmetic number, because the mean of its divisors is an integer number (7837560).

Almost surely, 2^66530648 is an apocalyptic number.

It is an amenable number.

66530648 is a deficient number, since it is larger than the sum of its proper divisors (58870312).

66530648 is a wasteful number, since it uses less digits than its factorization.

66530648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43738 (or 43734 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 66530648 is about 8156.6321481357. The cubic root of 66530648 is about 405.2041809446.

It can be divided in two parts, 665 and 30648, that multiplied together give a triangular number (20380920 = T₆₃₈₄).

The spelling of 66530648 in words is "sixty-six million, five hundred thirty thousand, six hundred forty-eight".