641466081 has 32 divisors (see below), whose sum is σ = 967317120. Its totient is φ = 420057792.

The previous prime is 641466079. The next prime is 641466097. The reversal of 641466081 is 180664146.

641466081 is a `hidden beast` number, since 6 + 4 + 1 + 46 + 608 + 1 = 666.

It is not a de Polignac number, because 641466081 - 2¹ = 641466079 is a prime.

It is a super-2 number, since 2×641466081² = 822957466146997122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641466031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 440751 + ... + 442203.

It is an arithmetic number, because the mean of its divisors is an integer number (30228660).

Almost surely, 2^641466081 is an apocalyptic number.

It is an amenable number.

641466081 is a deficient number, since it is larger than the sum of its proper divisors (325851039).

641466081 is a wasteful number, since it uses less digits than its factorization.

641466081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 641466081 is about 25327.1806761037. The cubic root of 641466081 is about 862.4314108028.

The spelling of 641466081 in words is "six hundred forty-one million, four hundred sixty-six thousand, eighty-one".