672211661 has 8 divisors (see below), whose sum is σ = 740583648. Its totient is φ = 605050000.

The previous prime is 672211651. The next prime is 672211663. The reversal of 672211661 is 166112276.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672211661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672211663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301415 + ... + 303636.

It is an arithmetic number, because the mean of its divisors is an integer number (92572956).

Almost surely, 2^672211661 is an apocalyptic number.

It is an amenable number.

672211661 is a deficient number, since it is larger than the sum of its proper divisors (68371987).

672211661 is a wasteful number, since it uses less digits than its factorization.

672211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605163.

The product of its digits is 6048, while the sum is 32.

The square root of 672211661 is about 25927.0449723836. The cubic root of 672211661 is about 875.9957799711.

The spelling of 672211661 in words is "six hundred seventy-two million, two hundred eleven thousand, six hundred sixty-one".