1640711916985 has 12 divisors (see below), whose sum is σ = 2091481905708. Its totient is φ = 1235359559936.

The previous prime is 1640711916973. The next prime is 1640711917021. The reversal of 1640711916985 is 5896191170461.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 64562236281 + 1576149680704 = 254091^2 + 1255448^2 .

It is not a de Polignac number, because 1640711916985 - 2²⁹ = 1640175046073 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 567718942 + ... + 567721831.

It is an arithmetic number, because the mean of its divisors is an integer number (174290158809).

Almost surely, 2^{1640711916985} is an apocalyptic number.

It is an amenable number.

1640711916985 is a deficient number, since it is larger than the sum of its proper divisors (450769988723).

1640711916985 is a wasteful number, since it uses less digits than its factorization.

1640711916985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135440812 (or 1135440795 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 58.

The spelling of 1640711916985 in words is "one trillion, six hundred forty billion, seven hundred eleven million, nine hundred sixteen thousand, nine hundred eighty-five".