643479492611 has 8 divisors (see below), whose sum is σ = 663985610064. Its totient is φ = 623202494080.

The previous prime is 643479492541. The next prime is 643479492613. The reversal of 643479492611 is 116294974346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643479492611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643479492613) 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 7 ways as a sum of consecutive naturals, for example, 57274025 + ... + 57285258.

It is an arithmetic number, because the mean of its divisors is an integer number (82998201258).

Almost surely, 2^643479492611 is an apocalyptic number.

643479492611 is a deficient number, since it is larger than the sum of its proper divisors (20506117453).

643479492611 is a wasteful number, since it uses less digits than its factorization.

643479492611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114559461.

The product of its digits is 7838208, while the sum is 56.

The spelling of 643479492611 in words is "six hundred forty-three billion, four hundred seventy-nine million, four hundred ninety-two thousand, six hundred eleven".