643584052078 has 8 divisors (see below), whose sum is σ = 1053137539800. Its totient is φ = 292538205480.

The previous prime is 643584052037. The next prime is 643584052081. The reversal of 643584052078 is 870250485346.

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

It is a super-2 number, since 2×643584052078² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14626910253 + ... + 14626910296.

It is an arithmetic number, because the mean of its divisors is an integer number (131642192475).

Almost surely, 2^643584052078 is an apocalyptic number.

643584052078 is a deficient number, since it is larger than the sum of its proper divisors (409553487722).

643584052078 is a wasteful number, since it uses less digits than its factorization.

643584052078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29253820562.

The product of its (nonzero) digits is 6451200, while the sum is 52.

The spelling of 643584052078 in words is "six hundred forty-three billion, five hundred eighty-four million, fifty-two thousand, seventy-eight".