1643461011 has 6 divisors (see below), whose sum is σ = 2373888140. Its totient is φ = 1095640668.

The previous prime is 1643460983. The next prime is 1643461013. The reversal of 1643461011 is 1101643461.

1643461011 is a `hidden beast` number, since 1 + 6 + 4 + 34 + 610 + 11 = 666.

It is not a de Polignac number, because 1643461011 - 2⁵ = 1643460979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643461013) 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 5 ways as a sum of consecutive naturals, for example, 91303381 + ... + 91303398.

Almost surely, 2^1643461011 is an apocalyptic number.

1643461011 is a deficient number, since it is larger than the sum of its proper divisors (730427129).

1643461011 is a wasteful number, since it uses less digits than its factorization.

1643461011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182606785 (or 182606782 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1643461011 is about 40539.6227288809. The cubic root of 1643461011 is about 1180.1026940692.

The spelling of 1643461011 in words is "one billion, six hundred forty-three million, four hundred sixty-one thousand, eleven".