66493847 has 16 divisors (see below), whose sum is σ = 78650880. Its totient is φ = 55025568.

The previous prime is 66493837. The next prime is 66493859. The reversal of 66493847 is 74839466.

It is a cyclic number.

It is not a de Polignac number, because 66493847 - 2⁴ = 66493831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66493837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35078 + ... + 36924.

It is an arithmetic number, because the mean of its divisors is an integer number (4915680).

Almost surely, 2^66493847 is an apocalyptic number.

66493847 is a deficient number, since it is larger than the sum of its proper divisors (12157033).

66493847 is a wasteful number, since it uses less digits than its factorization.

66493847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030.

The product of its digits is 870912, while the sum is 47.

The square root of 66493847 is about 8154.3759417873. The cubic root of 66493847 is about 405.1294551361.

The spelling of 66493847 in words is "sixty-six million, four hundred ninety-three thousand, eight hundred forty-seven".