640254162105 has 64 divisors (see below), whose sum is σ = 1157977866240. Its totient is φ = 335575396800.

The previous prime is 640254162049. The next prime is 640254162113. The reversal of 640254162105 is 501261452046.

640254162105 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 541 + 6 + 2 + 105 = 666.

It is not a de Polignac number, because 640254162105 - 2²¹ = 640252064953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640254162105.

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 63 ways as a sum of consecutive naturals, for example, 2873544 + ... + 3088326.

It is an arithmetic number, because the mean of its divisors is an integer number (18093404160).

Almost surely, 2^640254162105 is an apocalyptic number.

It is an amenable number.

640254162105 is a deficient number, since it is larger than the sum of its proper divisors (517723704135).

640254162105 is a wasteful number, since it uses less digits than its factorization.

640254162105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215179 (or 215173 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

It can be divided in two parts, 6402541 and 62105, that added together give a palindrome (6464646).

The spelling of 640254162105 in words is "six hundred forty billion, two hundred fifty-four million, one hundred sixty-two thousand, one hundred five".