643191559813 has 4 divisors (see below), whose sum is σ = 701663519808. Its totient is φ = 584719599820.

The previous prime is 643191559789. The next prime is 643191559837. The reversal of 643191559813 is 318955191346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (643191559789) and next prime (643191559837).

It is a cyclic number.

It is not a de Polignac number, because 643191559813 - 2⁵ = 643191559781 is a prime.

It is a super-2 number, since 2×643191559813² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643191559873) 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, 29235979981 + ... + 29235980002.

It is an arithmetic number, because the mean of its divisors is an integer number (175415879952).

Almost surely, 2^643191559813 is an apocalyptic number.

It is an amenable number.

643191559813 is a deficient number, since it is larger than the sum of its proper divisors (58471959995).

643191559813 is a wasteful number, since it uses less digits than its factorization.

643191559813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58471959994.

The product of its digits is 3499200, while the sum is 55.

The spelling of 643191559813 in words is "six hundred forty-three billion, one hundred ninety-one million, five hundred fifty-nine thousand, eight hundred thirteen".