643125563430 has 64 divisors (see below), whose sum is σ = 1766728350720. Its totient is φ = 146772895104.

The previous prime is 643125563407. The next prime is 643125563441. The reversal of 643125563430 is 34365521346.

It is a super-2 number, since 2×643125563430² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2230825 + ... + 2502564.

It is an arithmetic number, because the mean of its divisors is an integer number (27605130480).

Almost surely, 2^643125563430 is an apocalyptic number.

643125563430 is an abundant number, since it is smaller than the sum of its proper divisors (1123602787290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643125563430 is a wasteful number, since it uses less digits than its factorization.

643125563430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734053.

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 643125563430 in words is "six hundred forty-three billion, one hundred twenty-five million, five hundred sixty-three thousand, four hundred thirty".