643923983001 has 32 divisors (see below), whose sum is σ = 979144443648. Its totient is φ = 372895488000.

The previous prime is 643923982957. The next prime is 643923983029. The reversal of 643923983001 is 100389329346.

It is a happy number.

It is not a de Polignac number, because 643923983001 - 2⁶ = 643923982937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643923983051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4572300 + ... + 4711026.

It is an arithmetic number, because the mean of its divisors is an integer number (30598263864).

Almost surely, 2^643923983001 is an apocalyptic number.

It is an amenable number.

643923983001 is a deficient number, since it is larger than the sum of its proper divisors (335220460647).

643923983001 is a wasteful number, since it uses less digits than its factorization.

643923983001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145761.

The product of its (nonzero) digits is 839808, while the sum is 48.

The spelling of 643923983001 in words is "six hundred forty-three billion, nine hundred twenty-three million, nine hundred eighty-three thousand, one".