667601271 has 90 divisors (see below), whose sum is σ = 1132240560. Its totient is φ = 391817088.

The previous prime is 667601269. The next prime is 667601317. The reversal of 667601271 is 172106766.

It is not a de Polignac number, because 667601271 - 2¹ = 667601269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667601201) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 8450610 + ... + 8450688.

Almost surely, 2^667601271 is an apocalyptic number.

667601271 is a deficient number, since it is larger than the sum of its proper divisors (464639289).

667601271 is a wasteful number, since it uses less digits than its factorization.

667601271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 667601271 is about 25837.9811711364. The cubic root of 667601271 is about 873.9885001637.

The spelling of 667601271 in words is "six hundred sixty-seven million, six hundred one thousand, two hundred seventy-one".