640601355 has 8 divisors (see below), whose sum is σ = 1024962192. Its totient is φ = 341654048.

The previous prime is 640601341. The next prime is 640601363. The reversal of 640601355 is 553106046.

640601355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 640601355 - 2¹² = 640597259 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21353364 + ... + 21353393.

It is an arithmetic number, because the mean of its divisors is an integer number (128120274).

Almost surely, 2^640601355 is an apocalyptic number.

640601355 is a deficient number, since it is larger than the sum of its proper divisors (384360837).

640601355 is a wasteful number, since it uses less digits than its factorization.

640601355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42706765.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 640601355 is about 25310.1038125093. The cubic root of 640601355 is about 862.0437040339.

The spelling of 640601355 in words is "six hundred forty million, six hundred one thousand, three hundred fifty-five".