671254661 has 32 divisors (see below), whose sum is σ = 854323200. Its totient is φ = 512265600.

The previous prime is 671254651. The next prime is 671254669. The reversal of 671254661 is 166452176.

It is a de Polignac number, because none of the positive numbers 2^k-671254661 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 (671254669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1087625 + ... + 1088241.

It is an arithmetic number, because the mean of its divisors is an integer number (26697600).

Almost surely, 2^671254661 is an apocalyptic number.

It is an amenable number.

671254661 is a deficient number, since it is larger than the sum of its proper divisors (183068539).

671254661 is a wasteful number, since it uses less digits than its factorization.

671254661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905.

The product of its digits is 60480, while the sum is 38.

The square root of 671254661 is about 25908.5827671063. The cubic root of 671254661 is about 875.5798761935.

The spelling of 671254661 in words is "six hundred seventy-one million, two hundred fifty-four thousand, six hundred sixty-one".