643870554327 has 48 divisors (see below), whose sum is σ = 1248718668288. Its totient is φ = 308749112640.

The previous prime is 643870554307. The next prime is 643870554343. The reversal of 643870554327 is 723455078346.

It is a happy number.

643870554327 is a `hidden beast` number, since 6 + 4 + 3 + 8 + 70 + 5 + 543 + 27 = 666.

It is not a de Polignac number, because 643870554327 - 2²² = 643866360023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643870554307) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35725843 + ... + 35743860.

It is an arithmetic number, because the mean of its divisors is an integer number (26014972256).

Almost surely, 2^643870554327 is an apocalyptic number.

643870554327 is a deficient number, since it is larger than the sum of its proper divisors (604848113961).

643870554327 is a wasteful number, since it uses less digits than its factorization.

643870554327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71469740 (or 71469737 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 54.

The spelling of 643870554327 in words is "six hundred forty-three billion, eight hundred seventy million, five hundred fifty-four thousand, three hundred twenty-seven".