640065023214071 has 32 divisors (see below), whose sum is σ = 795934715089920. Its totient is φ = 501178367886336.

The previous prime is 640065023214049. The next prime is 640065023214091. The reversal of 640065023214071 is 170412320560046.

It is not a de Polignac number, because 640065023214071 - 2¹⁸ = 640065022951927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640065023214091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170329670 + ... + 174046908.

It is an arithmetic number, because the mean of its divisors is an integer number (24872959846560).

Almost surely, 2^{640065023214071} is an apocalyptic number.

640065023214071 is a deficient number, since it is larger than the sum of its proper divisors (155869691875849).

640065023214071 is a wasteful number, since it uses less digits than its factorization.

640065023214071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736863.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 640065023214071 in words is "six hundred forty trillion, sixty-five billion, twenty-three million, two hundred fourteen thousand, seventy-one".