671551611 has 4 divisors (see below), whose sum is σ = 895402152. Its totient is φ = 447701072.

The previous prime is 671551609. The next prime is 671551619. The reversal of 671551611 is 116155176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671551611 - 2¹ = 671551609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671551619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111925266 + ... + 111925271.

It is an arithmetic number, because the mean of its divisors is an integer number (223850538).

Almost surely, 2^671551611 is an apocalyptic number.

671551611 is a deficient number, since it is larger than the sum of its proper divisors (223850541).

671551611 is a wasteful number, since it uses less digits than its factorization.

671551611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223850540.

The product of its digits is 6300, while the sum is 33.

The square root of 671551611 is about 25914.3128598850. The cubic root of 671551611 is about 875.7089703255.

The spelling of 671551611 in words is "six hundred seventy-one million, five hundred fifty-one thousand, six hundred eleven".