643631222433461 has 8 divisors (see below), whose sum is σ = 654181462771200. Its totient is φ = 633147545126752.

The previous prime is 643631222433377. The next prime is 643631222433487. The reversal of 643631222433461 is 164334222136346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643631222433461 is a prime.

It is a super-2 number, since 2×643631222433461² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643631222433161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16640738261 + ... + 16640776938.

It is an arithmetic number, because the mean of its divisors is an integer number (81772682846400).

Almost surely, 2^{643631222433461} is an apocalyptic number.

It is an amenable number.

643631222433461 is a deficient number, since it is larger than the sum of its proper divisors (10550240337739).

643631222433461 is a wasteful number, since it uses less digits than its factorization.

643631222433461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33281515515.

The product of its digits is 8957952, while the sum is 50.

The spelling of 643631222433461 in words is "six hundred forty-three trillion, six hundred thirty-one billion, two hundred twenty-two million, four hundred thirty-three thousand, four hundred sixty-one".