640711183 has 8 divisors (see below), whose sum is σ = 732447360. Its totient is φ = 549026520.

The previous prime is 640711133. The next prime is 640711189. The reversal of 640711183 is 381117046.

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

It is not a de Polignac number, because 640711183 - 2¹³ = 640702991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640711189) 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, 19068 + ... + 40558.

It is an arithmetic number, because the mean of its divisors is an integer number (91555920).

Almost surely, 2^640711183 is an apocalyptic number.

640711183 is a deficient number, since it is larger than the sum of its proper divisors (91736177).

640711183 is a wasteful number, since it uses less digits than its factorization.

640711183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25757.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 640711183 is about 25312.2733668867. The cubic root of 640711183 is about 862.0929656249.

The spelling of 640711183 in words is "six hundred forty million, seven hundred eleven thousand, one hundred eighty-three".