643425124432 has 20 divisors (see below), whose sum is σ = 1247260494996. Its totient is φ = 321551448320.

The previous prime is 643425124429. The next prime is 643425124457. The reversal of 643425124432 is 234421524346.

It can be written as a sum of positive squares in 2 ways, for example, as 54393434176 + 589031690256 = 233224^2 + 767484^2 .

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, 10036669 + ... + 10100572.

Almost surely, 2^643425124432 is an apocalyptic number.

It is an amenable number.

643425124432 is a deficient number, since it is larger than the sum of its proper divisors (603835370564).

643425124432 is a wasteful number, since it uses less digits than its factorization.

643425124432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20139246 (or 20139240 counting only the distinct ones).

The product of its digits is 552960, while the sum is 40.

Adding to 643425124432 its reverse (234421524346), we get a palindrome (877846648778).

The spelling of 643425124432 in words is "six hundred forty-three billion, four hundred twenty-five million, one hundred twenty-four thousand, four hundred thirty-two".