66703871 has 4 divisors (see below), whose sum is σ = 71834952. Its totient is φ = 61572792.

The previous prime is 66703867. The next prime is 66703877. The reversal of 66703871 is 17830766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66703871 - 2² = 66703867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66703877) 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, 2565521 + ... + 2565546.

It is an arithmetic number, because the mean of its divisors is an integer number (17958738).

Almost surely, 2^66703871 is an apocalyptic number.

66703871 is a deficient number, since it is larger than the sum of its proper divisors (5131081).

66703871 is a wasteful number, since it uses less digits than its factorization.

66703871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131080.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66703871 is about 8167.2437823295. The cubic root of 66703871 is about 405.5555471015. Note that the first 4 decimals are identical.

The spelling of 66703871 in words is "sixty-six million, seven hundred three thousand, eight hundred seventy-one".