1646317305644 has 12 divisors (see below), whose sum is σ = 3142969401768. Its totient is φ = 748326048000.

The previous prime is 1646317305637. The next prime is 1646317305683. The reversal of 1646317305644 is 4465037136461.

It is a junction number, because it is equal to n+sod(n) for n = 1646317305592 and 1646317305601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18708151157 + ... + 18708151244.

It is an arithmetic number, because the mean of its divisors is an integer number (261914116814).

Almost surely, 2^{1646317305644} is an apocalyptic number.

It is an amenable number.

1646317305644 is a deficient number, since it is larger than the sum of its proper divisors (1496652096124).

1646317305644 is a wasteful number, since it uses less digits than its factorization.

1646317305644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37416302416 (or 37416302414 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 1646317305644 in words is "one trillion, six hundred forty-six billion, three hundred seventeen million, three hundred five thousand, six hundred forty-four".