643215042063 has 24 divisors (see below), whose sum is σ = 1023586149456. Its totient is φ = 385967616000.

The previous prime is 643215042047. The next prime is 643215042089. The reversal of 643215042063 is 360240512346.

643215042063 is a `hidden beast` number, since 6 + 432 + 15 + 0 + 4 + 206 + 3 = 666.

It is not a de Polignac number, because 643215042063 - 2⁴ = 643215042047 is a prime.

It is a super-2 number, since 2×643215042063² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643215042023) 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 23 ways as a sum of consecutive naturals, for example, 32153970 + ... + 32173967.

It is an arithmetic number, because the mean of its divisors is an integer number (42649422894).

Almost surely, 2^643215042063 is an apocalyptic number.

643215042063 is a deficient number, since it is larger than the sum of its proper divisors (380371107393).

643215042063 is a wasteful number, since it uses less digits than its factorization.

643215042063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64328055 (or 64328052 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 643215042063 in words is "six hundred forty-three billion, two hundred fifteen million, forty-two thousand, sixty-three".