640201355 has 4 divisors (see below), whose sum is σ = 768241632. Its totient is φ = 512161080.

The previous prime is 640201349. The next prime is 640201381. The reversal of 640201355 is 553102046.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 640201355 - 2⁶ = 640201291 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64020131 + ... + 64020140.

It is an arithmetic number, because the mean of its divisors is an integer number (192060408).

Almost surely, 2^640201355 is an apocalyptic number.

640201355 is a deficient number, since it is larger than the sum of its proper divisors (128040277).

640201355 is a wasteful number, since it uses less digits than its factorization.

640201355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128040276.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 640201355 is about 25302.2005959956. The cubic root of 640201355 is about 861.8642428275.

The spelling of 640201355 in words is "six hundred forty million, two hundred one thousand, three hundred fifty-five".