640467176071 has 4 divisors (see below), whose sum is σ = 654094137312. Its totient is φ = 626840214832.

The previous prime is 640467176051. The next prime is 640467176081. The reversal of 640467176071 is 170671764046.

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

It is a cyclic number.

It is not a de Polignac number, because 640467176071 - 2⁹ = 640467175559 is a prime.

It is a super-2 number, since 2×640467176071² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640467176051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6813480550 + ... + 6813480643.

It is an arithmetic number, because the mean of its divisors is an integer number (163523534328).

Almost surely, 2^640467176071 is an apocalyptic number.

640467176071 is a deficient number, since it is larger than the sum of its proper divisors (13626961241).

640467176071 is a wasteful number, since it uses less digits than its factorization.

640467176071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13626961240.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 640467176071 in words is "six hundred forty billion, four hundred sixty-seven million, one hundred seventy-six thousand, seventy-one".