643662088641 has 24 divisors (see below), whose sum is σ = 1092275061696. Its totient is φ = 360090678240.

The previous prime is 643662088639. The next prime is 643662088649. The reversal of 643662088641 is 146880266346.

643662088641 is a `hidden beast` number, since 6 + 4 + 3 + 6 + 620 + 8 + 8 + 6 + 4 + 1 = 666.

It is not a de Polignac number, because 643662088641 - 2¹ = 643662088639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643662088649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250061685 + ... + 250064258.

It is an arithmetic number, because the mean of its divisors is an integer number (45511460904).

Almost surely, 2^643662088641 is an apocalyptic number.

It is an amenable number.

643662088641 is a deficient number, since it is larger than the sum of its proper divisors (448612973055).

643662088641 is a wasteful number, since it uses less digits than its factorization.

643662088641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500125973 (or 500125970 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 643662088641 in words is "six hundred forty-three billion, six hundred sixty-two million, eighty-eight thousand, six hundred forty-one".