1640829922556 has 72 divisors (see below), whose sum is σ = 3206293297200. Its totient is φ = 728655573760.

The previous prime is 1640829922549. The next prime is 1640829922559. The reversal of 1640829922556 is 6552299280461.

It is a junction number, because it is equal to n+sod(n) for n = 1640829922495 and 1640829922504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640829922559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55289690 + ... + 55319358.

It is an arithmetic number, because the mean of its divisors is an integer number (44531851350).

Almost surely, 2^{1640829922556} is an apocalyptic number.

It is an amenable number.

1640829922556 is a deficient number, since it is larger than the sum of its proper divisors (1565463374644).

1640829922556 is a wasteful number, since it uses less digits than its factorization.

1640829922556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347 (or 30298 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 59.

The spelling of 1640829922556 in words is "one trillion, six hundred forty billion, eight hundred twenty-nine million, nine hundred twenty-two thousand, five hundred fifty-six".