66746665 has 8 divisors (see below), whose sum is σ = 80147520. Its totient is φ = 53362992.

The previous prime is 66746653. The next prime is 66746671. The reversal of 66746665 is 56664766.

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 66746665 - 2¹³ = 66738473 is a prime.

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, 6922 + ... + 13468.

It is an arithmetic number, because the mean of its divisors is an integer number (10018440).

Almost surely, 2^66746665 is an apocalyptic number.

It is an amenable number.

66746665 is a deficient number, since it is larger than the sum of its proper divisors (13400855).

66746665 is a wasteful number, since it uses less digits than its factorization.

66746665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591.

The product of its digits is 1088640, while the sum is 46.

The square root of 66746665 is about 8169.8632179492. The cubic root of 66746665 is about 405.6422568815.

The spelling of 66746665 in words is "sixty-six million, seven hundred forty-six thousand, six hundred sixty-five".