66730071 has 16 divisors (see below), whose sum is σ = 94288640. Its totient is φ = 41860800.

The previous prime is 66730051. The next prime is 66730087. The reversal of 66730071 is 17003766.

It is a de Polignac number, because none of the positive numbers 2^k-66730071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66730031) 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, 4731 + ... + 12483.

It is an arithmetic number, because the mean of its divisors is an integer number (5893040).

Almost surely, 2^66730071 is an apocalyptic number.

66730071 is a deficient number, since it is larger than the sum of its proper divisors (27558569).

66730071 is a wasteful number, since it uses less digits than its factorization.

66730071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7926.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 66730071 is about 8168.8475931431. The cubic root of 66730071 is about 405.6086382955.

The spelling of 66730071 in words is "sixty-six million, seven hundred thirty thousand, seventy-one".