671666998 has 8 divisors (see below), whose sum is σ = 1007678808. Its totient is φ = 335774064.

The previous prime is 671666977. The next prime is 671667001. The reversal of 671666998 is 899666176.

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

It is a super-2 number, since 2×671666998² = 902273112404664008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13911 + ... + 39202.

It is an arithmetic number, because the mean of its divisors is an integer number (125959851).

Almost surely, 2^671666998 is an apocalyptic number.

671666998 is a deficient number, since it is larger than the sum of its proper divisors (336011810).

671666998 is a wasteful number, since it uses less digits than its factorization.

671666998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59438.

The product of its digits is 5878656, while the sum is 58.

The square root of 671666998 is about 25916.5390822154. The cubic root of 671666998 is about 875.7591226606.

The spelling of 671666998 in words is "six hundred seventy-one million, six hundred sixty-six thousand, nine hundred ninety-eight".