640201695 has 32 divisors (see below), whose sum is σ = 1172794368. Its totient is φ = 292128768.

The previous prime is 640201693. The next prime is 640201697. The reversal of 640201695 is 596102046.

It is an interprime number because it is at equal distance from previous prime (640201693) and next prime (640201697).

It is not a de Polignac number, because 640201695 - 2¹ = 640201693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640201693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55302 + ... + 65868.

It is an arithmetic number, because the mean of its divisors is an integer number (36649824).

Almost surely, 2^640201695 is an apocalyptic number.

640201695 is a deficient number, since it is larger than the sum of its proper divisors (532592673).

640201695 is a wasteful number, since it uses less digits than its factorization.

640201695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11159.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 640201695 is about 25302.2073147779. The cubic root of 640201695 is about 861.8643954012.

The spelling of 640201695 in words is "six hundred forty million, two hundred one thousand, six hundred ninety-five".