66643495 has 8 divisors (see below), whose sum is σ = 80092080. Its totient is φ = 53234880.

The previous prime is 66643487. The next prime is 66643523. The reversal of 66643495 is 59434666.

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

It is not a de Polignac number, because 66643495 - 2³ = 66643487 is a prime.

It is a congruent number.

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, 6190 + ... + 13099.

It is an arithmetic number, because the mean of its divisors is an integer number (10011510).

Almost surely, 2^66643495 is an apocalyptic number.

66643495 is a deficient number, since it is larger than the sum of its proper divisors (13448585).

66643495 is a wasteful number, since it uses less digits than its factorization.

66643495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19985.

The product of its digits is 466560, while the sum is 43.

The square root of 66643495 is about 8163.5467169607. The cubic root of 66643495 is about 405.4331493419.

The spelling of 66643495 in words is "sixty-six million, six hundred forty-three thousand, four hundred ninety-five".