66601071 has 12 divisors (see below), whose sum is σ = 97085560. Its totient is φ = 43992720.

The previous prime is 66601057. The next prime is 66601091. The reversal of 66601071 is 17010666.

It is not a de Polignac number, because 66601071 - 2¹⁵ = 66568303 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 (66601091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32965 + ... + 34926.

Almost surely, 2^66601071 is an apocalyptic number.

66601071 is a deficient number, since it is larger than the sum of its proper divisors (30484489).

66601071 is a wasteful number, since it uses less digits than its factorization.

66601071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68006 (or 68003 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 66601071 is about 8160.9479228825. The cubic root of 66601071 is about 405.3471006987.

The spelling of 66601071 in words is "sixty-six million, six hundred one thousand, seventy-one".