641456866 has 8 divisors (see below), whose sum is σ = 962970624. Its totient is φ = 320466660.

The previous prime is 641456863. The next prime is 641456873. The reversal of 641456866 is 668654146.

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

It is a super-2 number, since 2×641456866² = 822933821877083912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641456863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127810 + ... + 132733.

It is an arithmetic number, because the mean of its divisors is an integer number (120371328).

Almost surely, 2^641456866 is an apocalyptic number.

641456866 is a deficient number, since it is larger than the sum of its proper divisors (321513758).

641456866 is a wasteful number, since it uses less digits than its factorization.

641456866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261776.

The product of its digits is 829440, while the sum is 46.

The square root of 641456866 is about 25326.9987562680. The cubic root of 641456866 is about 862.4272810217.

The spelling of 641456866 in words is "six hundred forty-one million, four hundred fifty-six thousand, eight hundred sixty-six".