671570661 has 8 divisors (see below), whose sum is σ = 926304480. Its totient is φ = 432275312.

The previous prime is 671570657. The next prime is 671570671. The reversal of 671570661 is 166075176.

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 671570661 - 2² = 671570657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671570621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3859515 + ... + 3859688.

It is an arithmetic number, because the mean of its divisors is an integer number (115788060).

Almost surely, 2^671570661 is an apocalyptic number.

It is an amenable number.

671570661 is a deficient number, since it is larger than the sum of its proper divisors (254733819).

671570661 is a wasteful number, since it uses less digits than its factorization.

671570661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7719235.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 671570661 is about 25914.6804147765. The cubic root of 671570661 is about 875.7172507009.

The spelling of 671570661 in words is "six hundred seventy-one million, five hundred seventy thousand, six hundred sixty-one".