640110161605 has 16 divisors (see below), whose sum is σ = 772892640000. Its totient is φ = 508923092160.

The previous prime is 640110161563. The next prime is 640110161617. The reversal of 640110161605 is 506161011046.

It is not a de Polignac number, because 640110161605 - 2¹³ = 640110153413 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 59575 + ... + 1133035.

It is an arithmetic number, because the mean of its divisors is an integer number (48305790000).

Almost surely, 2^640110161605 is an apocalyptic number.

It is an amenable number.

640110161605 is a deficient number, since it is larger than the sum of its proper divisors (132782478395).

640110161605 is a wasteful number, since it uses less digits than its factorization.

640110161605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074204.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 640110161605 in words is "six hundred forty billion, one hundred ten million, one hundred sixty-one thousand, six hundred five".