648197661 has 8 divisors (see below), whose sum is σ = 901840320. Its totient is φ = 413343392.

The previous prime is 648197639. The next prime is 648197663. The reversal of 648197661 is 166791846.

It is a happy number.

648197661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 648197661 - 2⁵ = 648197629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648197661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648197663) 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, 4697016 + ... + 4697153.

It is an arithmetic number, because the mean of its divisors is an integer number (112730040).

Almost surely, 2^648197661 is an apocalyptic number.

It is an amenable number.

648197661 is a deficient number, since it is larger than the sum of its proper divisors (253642659).

648197661 is a wasteful number, since it uses less digits than its factorization.

648197661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394195.

The product of its digits is 435456, while the sum is 48.

The square root of 648197661 is about 25459.7262554019. The cubic root of 648197661 is about 865.4377198114.

The spelling of 648197661 in words is "six hundred forty-eight million, one hundred ninety-seven thousand, six hundred sixty-one".