1640880493281 has 8 divisors (see below), whose sum is σ = 2430934064160. Its totient is φ = 1093920328836.

The previous prime is 1640880493249. The next prime is 1640880493309. The reversal of 1640880493281 is 1823940880461.

It is a happy number.

1640880493281 is a `hidden beast` number, since 16 + 40 + 8 + 80 + 493 + 28 + 1 = 666.

It is not a de Polignac number, because 1640880493281 - 2⁵ = 1640880493249 is a prime.

It is a super-2 number, since 2×1640880493281² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1640880498281) 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 7 ways as a sum of consecutive naturals, for example, 30386675775 + ... + 30386675828.

It is an arithmetic number, because the mean of its divisors is an integer number (303866758020).

Almost surely, 2^{1640880493281} is an apocalyptic number.

It is an amenable number.

1640880493281 is a deficient number, since it is larger than the sum of its proper divisors (790053570879).

1640880493281 is an equidigital number, since it uses as much as digits as its factorization.

1640880493281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60773351612 (or 60773351606 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 1640880493281 in words is "one trillion, six hundred forty billion, eight hundred eighty million, four hundred ninety-three thousand, two hundred eighty-one".