640235421201 has 8 divisors (see below), whose sum is σ = 853819042720. Its totient is φ = 426737706912.

The previous prime is 640235421197. The next prime is 640235421209. The reversal of 640235421201 is 102124532046.

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

It is not a de Polignac number, because 640235421201 - 2² = 640235421197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640235421209) 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, 21459415 + ... + 21489228.

It is an arithmetic number, because the mean of its divisors is an integer number (106727380340).

Almost surely, 2^640235421201 is an apocalyptic number.

It is an amenable number.

640235421201 is a deficient number, since it is larger than the sum of its proper divisors (213583621519).

640235421201 is a wasteful number, since it uses less digits than its factorization.

640235421201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42953615.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 640235421201 its reverse (102124532046), we get a palindrome (742359953247).

The spelling of 640235421201 in words is "six hundred forty billion, two hundred thirty-five million, four hundred twenty-one thousand, two hundred one".