671661001 has 8 divisors (see below), whose sum is σ = 771285600. Its totient is φ = 578463840.

The previous prime is 671660987. The next prime is 671661071. The reversal of 671661001 is 100166176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671661001 - 2⁹ = 671660489 is a prime.

It is a super-3 number, since 3×671661001³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671661071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606636 + ... + 1607053.

It is an arithmetic number, because the mean of its divisors is an integer number (96410700).

Almost surely, 2^671661001 is an apocalyptic number.

It is an amenable number.

671661001 is a deficient number, since it is larger than the sum of its proper divisors (99624599).

671661001 is a wasteful number, since it uses less digits than its factorization.

671661001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213719.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 671661001 is about 25916.4233836384. The cubic root of 671661001 is about 875.7565162385.

The spelling of 671661001 in words is "six hundred seventy-one million, six hundred sixty-one thousand, one".