4671643561 has 4 divisors (see below), whose sum is σ = 5031000772. Its totient is φ = 4312286352.

The previous prime is 4671643547. The next prime is 4671643573. The reversal of 4671643561 is 1653461764.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 987153561 + 3684490000 = 31419^2 + 60700^2 .

It is a cyclic number.

It is not a de Polignac number, because 4671643561 - 2¹⁵ = 4671610793 is a prime.

It is a super-2 number, since 2×4671643561² = 43648507122065521442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4671643511) 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 3 ways as a sum of consecutive naturals, for example, 179678586 + ... + 179678611.

It is an arithmetic number, because the mean of its divisors is an integer number (1257750193).

Almost surely, 2^4671643561 is an apocalyptic number.

It is an amenable number.

4671643561 is a deficient number, since it is larger than the sum of its proper divisors (359357211).

4671643561 is a wasteful number, since it uses less digits than its factorization.

4671643561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359357210.

The product of its digits is 362880, while the sum is 43.

The square root of 4671643561 is about 68349.4225359659. The cubic root of 4671643561 is about 1671.6931637874.

The spelling of 4671643561 in words is "four billion, six hundred seventy-one million, six hundred forty-three thousand, five hundred sixty-one".