671668266 has 16 divisors (see below), whose sum is σ = 1422356544. Its totient is φ = 210719424.

The previous prime is 671668247. The next prime is 671668267. The reversal of 671668266 is 662866176.

It is a super-2 number, since 2×671668266² = 902276519102893512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671668267) 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, 3292390 + ... + 3292593.

It is an arithmetic number, because the mean of its divisors is an integer number (88897284).

Almost surely, 2^671668266 is an apocalyptic number.

671668266 is an abundant number, since it is smaller than the sum of its proper divisors (750688278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671668266 is a wasteful number, since it uses less digits than its factorization.

671668266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6585005.

The product of its digits is 870912, while the sum is 48.

The square root of 671668266 is about 25916.5635453468. The cubic root of 671668266 is about 875.7596737580.

The spelling of 671668266 in words is "six hundred seventy-one million, six hundred sixty-eight thousand, two hundred sixty-six".