640080201601 has 4 divisors (see below), whose sum is σ = 641051492400. Its totient is φ = 639108910804.

The previous prime is 640080201587. The next prime is 640080201611. The reversal of 640080201601 is 106102080046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640080201601 - 2²⁹ = 639543330689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640080201601.

It is not an unprimeable number, because it can be changed into a prime (640080201611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485644411 + ... + 485645728.

It is an arithmetic number, because the mean of its divisors is an integer number (160262873100).

Almost surely, 2^640080201601 is an apocalyptic number.

It is an amenable number.

640080201601 is a deficient number, since it is larger than the sum of its proper divisors (971290799).

640080201601 is an equidigital number, since it uses as much as digits as its factorization.

640080201601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971290798.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 640080201601 its reverse (106102080046), we get a palindrome (746182281647).

The spelling of 640080201601 in words is "six hundred forty billion, eighty million, two hundred one thousand, six hundred one".