667661301 has 12 divisors (see below), whose sum is σ = 986828128. Its totient is φ = 434755944.

The previous prime is 667661249. The next prime is 667661327. The reversal of 667661301 is 103166766.

It is not a de Polignac number, because 667661301 - 2⁷ = 667661173 is a prime.

It is a super-2 number, since 2×667661301² = 891543225706025202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667661381) 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, 862225 + ... + 862998.

Almost surely, 2^667661301 is an apocalyptic number.

It is an amenable number.

667661301 is a deficient number, since it is larger than the sum of its proper divisors (319166827).

667661301 is a wasteful number, since it uses less digits than its factorization.

667661301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725272 (or 1725269 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 667661301 is about 25839.1428069896. The cubic root of 667661301 is about 874.0146954190.

The spelling of 667661301 in words is "six hundred sixty-seven million, six hundred sixty-one thousand, three hundred one".