1640246279841 has 27 divisors (see below), whose sum is σ = 2565591538419. Its totient is φ = 1009351588752.

The previous prime is 1640246279839. The next prime is 1640246279843. The reversal of 1640246279841 is 1489726420461.

The square root of 1640246279841 is 1280721.

It is a perfect power (a square), and thus also a powerful number.

1640246279841 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 2 + 4 + 627 + 9 + 8 + 4 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1640246279839) and next prime (1640246279843).

It can be written as a sum of positive squares in only one way, i.e., 242639982225 + 1397606297616 = 492585^2 + 1182204^2 .

It is not a de Polignac number, because 1640246279841 - 2¹ = 1640246279839 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640246279843) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 49931700 + ... + 49964538.

Almost surely, 2^{1640246279841} is an apocalyptic number.

1640246279841 is the 1280721-st square number.

1640246279841 is the 640361-st centered octagonal number.

It is an amenable number.

1640246279841 is a deficient number, since it is larger than the sum of its proper divisors (925345258578).

1640246279841 is an frugal number, since it uses more digits than its factorization.

1640246279841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65710 (or 32855 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 1640246279841 in words is "one trillion, six hundred forty billion, two hundred forty-six million, two hundred seventy-nine thousand, eight hundred forty-one".